NEWS

1.7.3 -> 1.8.0
  * AbaqusIO
    - Add Abaqus element maps for TRI6 and QUAD8 elements
    - Make nodeset/sideset counter types in Abaqus mesh reader consistent with other boundaries
    - Do a better job of respecting Abaqus node and element numbers
    - Add file compression support to Abaqus reads
    - Fix off-by-one error in Abaqus element renumbering
    - Make AbaqusIO extendable to enable parsing of UMATs (#3969)
  * Elem
    - Add Tri7 element and associated library support
    - Add Tet14 element and associated library support
    - Add ElemSideBuilder
    - Add Elem::side_type()
    - Add Elem::quasicircumcenter()
    - Add Prism20, Prism21 elements
    - Add NodeElem contains_point() and close_to_point() implementations
    - Add Pyramid18 element and associated library support
    - Add subdomain_id to elem info output (#3487)
    - Add Elem::topologically_equal()
    - Add Elem::is_flipped()
    - Add generic Elem::quality(ASPECT_RATIO), add unit tests for Elem quality metrics
    - Reorder InfHex children
    - Add Elem::complete_order_equivalent_type()
    - Better error message for RemoteElem:: methods
    - Add Elem::low_order_key()
    - Don't die in Elem::volume() on a twisted element
    - Add QUADSHELL9 element and shell elem unit tests
    - Add Elem::is_internal() API for identifying internal (non-vertex/edge/side) nodes
    - Add improved ASPECT_RATIO quality metric for Quad elements with unit tests
    - Add Tri::quality(ASPECT_RATIO) implementation and unit tests
    - Rename existing, generic ASPECT_RATIO metric to EDGE_LENGTH_RATIO
    - Add pure virtual Elem::edges_adjacent_to_node() function and overrides
    - Add generic Elem::quality(MIN,MAX_ANGLE) implementation
    - Add generic Elem::quality(MIN,MAX_DIHEDRAL_ANGLE) implementation
    - Add generic Elem::quality(JACOBIAN, SCALED_JACOBIAN) implementation
    - Add Elem::max_nodal_order() API
    - Add Elem::positive_{edge,face}_orientation() APIs
* ExodusII
    - Add ExodusII_IO::get_{side,node}set_data_indices()
    - Fix for writing write Exodus from multiple procs at once
    - Add new BEX element types to ExodusII helper
    - Add ExodusII_IO::write_elemsets()
    - Add/use ExodusII_IO_Helper::read_elemset_info()
    - Add/use ExodusII_IO_Helper::read_elemset()
    - Add ExodusII_IO::{write,read}_elemset_data()
    - Fix deprecated Exodus calls (e.g. exII::ex_get_var_param() -> exII::ex_get_variable_param())
    - Add ExodusII_IO_Helper::set_add_sides(), ExodusII::write_added_sides()
    - Add named block, sideset, and nodeset support for Nemesis meshes
    - Fixes for edge block reading
    - Do not throw from ExodusII_IO_Helper::close()
    - Fix for Exodus writer when sideset and shellface set have same id
    - Add Exodus EDGE4 support
    - Add "WEDGE6" to ExodusII helper
    - Avoid manual memory allocation in ExodusII_IO_Helper::read_qa_records()
  * IGA
    - Update 3D IGA projection regression test values
    - Add MeshTools::clear_spline_nodes()
    - Optimize 1D, 2D, 3D IGA derivative calculations
    - Add support for Bezier elements in VTK output
    - Weight spline nodes heavily when partitioning
    - Always number IGA nodes consecutively
  * FE
    - Add HIERARCHIC FE support for tets
    - Add SIDE_HIERARCHIC support for triangles
    - Add fe_fdm_deriv(), fe_fdm_second_deriv() support for derivatives of Bernstein, Szabo-Babushka, HIERARCHIC basis functions
    - Fixes/improvements for single, quad-precision Real
    - Remove caching from FE<CLOUGH>, Clough-Tocher should work multithreaded now
    - Factor out common code in BERNSTEIN p=3,4
    - Factor out edge flip calculation on Sza-Bab quads
    - Add L2_HIERARCHIC support on Tets and Prisms
    - Add _elem_p_level variable in FEAbstract
    - Add Raviart-Thomas 2D, 3D support
    - Introduce H_DIV FEContinuity enumeration
    - Add vector_fe_ex{6,7,8,9}
    - Create L2_RAVIART_THOMAS FE Family
    - Error if mismatched p-levels for Lagrange between neighbors
    - Create L2_LAGRANGE_VEC FE Family
    - Add FEInterface::is_hierarchic()
    - Add HIERARCHIC_VEC and L2_HIERARCHIC_VEC FE Families
    - Add support for 2D Nedelec shape functions, 2nd-5th order
    - Instantiate FIFTH order unit tests for MONOMIAL FEs
    - Throw an error in opt mode for HIERARCHIC p=0
    - Average side nodal solutions for H_DIV elements
  * Mesh
    - Move stitching from Replicated->Unstructured Mesh
    - Add MeshBase::change_elemset_code(), MeshBase::get_elemset_codes()
    - Add MeshBase::active_unpartitioned_element_ptr_range()
    - Support Laplace smoothing of unpartitioned meshes
    - Add support for reading/writing elemset codes in Xdr files
    - Add BoundaryInfo::renumber_id()
    - Add MeshBase::reinit_ghosting_functors() API
    - Add QUADSHELL{4,8} support to MeshTools::Generation::build_square()
    - Add MeshTools::Modification::orient_elements()
    - Allow child elements to have BoundaryInfo associated with them
    - Add MeshBase::operator==()
    - Add BoundaryInfo::operator==()
    - Add MeshBase::copy_constraint_rows()
    - Add MeshRefinement::_allow_unrefined_patches flag and accessor
    - Macroify all the mesh iterators
    - Add option for removing global boundary ID in remove_id()
    - Add remap_subdomain_ids capability in stitch_meshes
    - Preserve id(), subdomain_id() when reading VTK elements
    - Add BoundaryInfo::libmesh_assert_valid_multimaps()
    - Add MeshBase::copy_constraint_rows(Matrix) function
    - Support TRI7 in build_sphere()
    - Add MeshBase::n_constraint_rows(), print_constraint_rows()
    - Use connect_element_dependencies() in CheckpointIO
    - Fix VTK unit test with DistributedMesh
    - Add MeshTools::MeshGeneration::build_square(TRISHELL3) support
    - Add entities BoundingBox testing in GmshIO
    - Add MeshTetInterface::volume_to_surface_mesh()
    - Add tet support to MeshTools::MeshGeneration::build_sphere()
    - Add MeshTools::volume()
    - Add unit tests for MeshSmoother subclasses
    - Fix ReplicatedMesh(DistributedMesh&) construction
    - Update id counts in MeshCommunication::broadcast()
    - Add STLIO class, add .stl support to NameBasedIO
    - MeshBase::elem_orders() API
    - Add triangulation, tetrahedralization options to meshtool app
    - Allow MeshFunction::find_element() to return a non-local Elem provided that it is evaluable
    - Add SimplexRefiner class
    - Add MeshTools::Generation::surface_octahedron()
  * Miscellaneous
    - C++17 support is now required
    - Add/use exceptionless_{semi}parallel_object_only() macro
    - Add plain integrals to calculator app
    - Fix FParser JIT compilation on Apple M1
    - Add configure --enable-hdf5-required option
    - Fix all_second_order() bug with extra integers
    - Eliminate valgrind errors using a condition_variable
    - Implement doubly-checked lock for _get_array()
    - Add static TensorValue::rotation_matrix() helper
    - Lock against concurrent read-write in PetscVector::add()
    - Add std::hash<Point> overload
    - Increased constness in {const_,} elem_iterator
    - Add PerfLog for our unit tests
    - Add unit test for MeshBase::all_second_order_range()
    - Use std::make_unique everywhere, deprecate libmesh_make_unique
    - Use std::string_view in place of std::string references
    - Remove long-deprecated overload MeshTools::find_boundary_nodes()
    - Remove deprected UniquePtr workaround for std::unique_ptr
    - Use C++17 structured bindings in many for-loops
    - Implement many clang-tidy suggestions
    - Add Utility::CompareUnderlying helper struct
    - Avoid using AC_CHECK_HEADER to search for petscversion.h
    - Don't lock in libmesh_singleton.C
    - Give a warning if an Exodus variable name will be truncated
    - Remove __SUNPRO_CC specific code
    - Avoid manual memory management in variant_iterator
    - Use std::stack for managing DiffPhysics, DiffQoI lifetimes
    - Require support for enum forward declarations
    - Add unit test of find_neighbors() on mesh of 1D elements with different orientations
    - Add more generic index_range() support (for any container that has a size() method) (#3377)
    - Factor out common {left,right}_multiply_transpose() code
    - Fix for VTK 9.2 linking to libvtksys
    - Add allow_nodal_pyramid_quadrature flag, use in unit tests
    - Prefer std::to_string over sprintf
    - Don't call setenv on Windows builds
    - Use NBX algorithm in send_coarse_ghosts(), redistribute()
    - Fix NumericVector::compare()
    - Add NonlinearSolver::set_exact_constraint_enforcement()
    - Prefer using std::make_unique to new whenever possible
    - Change unsigned int to size_t in CouplingMatrix to prevent overflow for large number of variables (#3541)
    - Various fixes related to fsanitize=integer
    - Add way to disable use of p-refinement when doing FE::reinit
    - Fix parallel bounding box union in get_info()
    - Output any plain *FLAGS (from environment) in config_summary
    - Avoid partially merging boundary nodes when stitching, return number of merged nodes
    - Factor divisions out of hilbert index calculations
    - Add DiffContext allocate_local_matrices option
    - Upgrade to autoconf 2.71
    - Don't include vtkConfigure.h when compiling with VTK 9.3
    - Add clone method to QBase
    - Add more general matrix packing (#3662)
    - Add unit test of writing an XDR file for a refined mesh with extra elem integers
    - Add support for --with-xdr-include and --with-xdr-libname configure flags
    - Make enum_to_string() and string_to_enum() thread-safe
    - Fix Eigen preconditioning in 64-bit builds
    - Only do CPPUNIT_ASSERT_THROW tests if libmesh exceptions are enabled
    - Initialize variables within if-statements when possible
    - Add a DofMap API to set need_full_sparsity_pattern
    - Add CLI option --print-constraints
    - Add MeshfreeInterpolationFunction class derived from FunctionBase<Number>
    - Various "make dist" fixes
    - Fix elem dof distribution for --node-major-dofs
    - Fix missing <memory> include in getpot.h
    - Add BoundingBox::contains(BoundingBox) unit test
    - Add FPEDisabler class, fix several cases where potential FPEs were detected
    - Make libmesh_terminate_handler() API available in libmesh.h
    - Add NonManifoldGhostingFunctor, SidesToElemMap classes
  * Numerics
    - Add SVD in preconditioner type
    - Allow use of matrix-free when computing residual and jacobian together
    - Fixes for petscdmlibmesh PETSc 3.18 compatibility
    - Workaround for PETSc 3.18 losing %D support
    - Add pointwise_divide() to PetscVector
    - PETSc 3.19 deprecated some convergence reasons
    - Convert PETSC_RELEASE_LESS_THAN macro usage to PETSC_VERSION_LESS_THAN
    - Add in-place L2 norm difference method
    - Add PETSc versioning macros that imitate PETSc's own macros
    - Add ability to specify absolute tolerance for linear solvers
    - Use VecGhostGetGhostIS instead of VecGetLocalToGlobalMapping
    - Clear used CLI args pre-PetscFinalize
    - Fix swap of init with non-init DistributedVector
    - Add SparseMatrix::read_matlab()
    - Add SparseMatrix::col_start()/stop()
    - Add PetscMatrix read_petsc_* methods
    - Fixes for strict petsc error code checking
    - Make sure every PetscFunctionBegin has a matching PetscFunctionReturn
    - Add matrixconvert app
    - Add SparseMatrix::solver_package()
    - Add SparseMatrix read support from zipped .m files
    - Add LIBMESH_PETSC_SUCCESS wrapping PETSC_SUCCESS macro
    - Pass unique_ptr by value to NumericVector::restore_subvector()
    - Add {NumericVector,SparseMatrix}::fuzzy_equals()
    - Add {absolute,relative}_fuzzy_equals() support for TypeVectors/TypeTensors of MetaPhysicL types
    - Add PetscMatrixBase<T>, base class for PetscMatrix<T> and PetscMatrixShellMatrix<T>
    - Initialize PetscVector private members consistently
    - Add StaticCondensation class, derived from PetscMatrixShellMatrix<T>
    - Add LibmeshPetscCallA(), LibmeshPetscCallQ() macros
  * PerfLog
    - PerfLog::fast_pop() should be noexcept
  * Poly2TriTriangulator
    - Add Poly2TriTriangulator, a subclass of TriangulatorInterface
    - Add Poly2TriBadMultiBoundary unit test
    - Don't let DistributedMesh number poly2tri nodes
    - Add distance_from_circumcircle() API
    - Support converting Edge3 to triangulator segments
  * Reduced Basis
    - Add interpolationPhiValues to RBEIMEvaluation capnproto schema
    - Update to how observation points for EIM basis functions are evaluated
    - Fix race condition in writing header in RBEvaluation::write_out_vectors()
    - Update RBEIMConstruction::enrich_eim_approximation()
    - Fix for shellfaces in RBEIMEvaluation::side_distribute_bfs()
    - Update to RBConstructionBase<Base>::get_n_training_samples() (#3115)
    - Use best_fit_type_flag to switch between POD and Greedy EIM training
    - Add virtual methods for specifying index maps for the RBParametrizedFunction in EIM approximations
    - Add support for EIM on nodesets
    - Fix to apply constraints and scaling inside node assembly in add_scaled_matrix_and_vector()
    - Allow empty EIM basis in RBEIMConstruction::train_eim_approximation_with_POD()
    - RBConstruction: Re-throw exceptions on all procs in parallel
    - Add RBParameters::has_value(), has_extra_value() APIs
    - Deprecate RBParameters::get_parameters_map()
    - RBParameters: store std::vector<Real> instead of single Real
    - Add RBParameters::set_value(name, index, value) and RBParameters::push_back_value() APIs
    - Provide STL iterator typedefs for RBParameters::const_iterator
    - const correctness updates for RBThetaExpansion, RBConstruction APIs
    - Add RBParameters::push_back_extra_value(), RBParameters::get_extra_step_value()
    - Add EIM error indicator based on using one extra EIM iteration
    - Add VectorizedEvalInput struct to encapsulate inputs to vectorized_evaluate() functions
    - Introduce scaling option into RBEIMConstruction inner products
    - Replace NumericVector with std::vector in RBConstructionBase
    - Add support for storing each RB parameter as a vector quantity
    - Handle the case where we encounter linearly dependent data in EIM
    - Add EIMVarGroupPlottingInfo struct, update EIM plotting functions
    - Make preevaluate_thetas() virtual, it should be overridden in derived classes
    - Add elem center tangent derivative storage for VectorizedEvalInput in EIM
    - Add virtual RBEIMEvaluation::project_qp_data_vector_onto_system() API
    - Remove previous EIM bf projection methods that are not needed
  * Submodules
    - Update MetaPhysicL to 1.4.0+
    - Update TIMPI to 1.8.5+
    - Update autoconf-submodule, add support for Nvidia, gcc11, icc21 compilers
    - Add poly2tri submodule
    - Update nanoflann (#3121)
    - Add Eigen submodule, update to version 3.4.0
    - Add NetCDF submodule at version 4.9.2
    - Add Netgen submodule currently at version 69f2ea56
  * System
    - Throw an error in EigenSystem::solve if we have constraints
    - Add shell matrix support for CondensedEigenSystem
    - Add System::has_constraint_object()
    - Make System::is_initialized() const
    - Add System matrix iterator APIs to match vector iterator APIs
    - Add CondensedEigenSystem::initialize_condensed_matrices(), have_condensed_dofs() APIs
    - Implement (Equation)System(s)::init() in terms of reinit_mesh()
  * TypeVector/TypeTensor
    - Add TypeVector::outer_product()
    - Add a column() API to TypeTensor
    - Add static_assert(is_trivially_copyable<TypeVector>)

1.7.1 -> 1.7.3
  * PETSc support
    - Full compatibility with PETSc 3.18 and 3.19
1.7.0 -> 1.7.1
  * PETSc support
    - Avoid using AC_CHECK_HEADER to search for petscversion.h
    - Full compatibility with PETSc 3.17
    - Remove method deprecated in C++17
    - Compatibility fix for MS VC 2019
1.6.2 -> 1.7.0
  * Benchmarking support
    - Add benchmark_example() macro, $LIBMESH_BENCHMARK env
    - Add CLI overrides, comments, performance logging, and benchmark parameters to many examples
  * BoundaryInfo
    - Apply zero-D nodeset names in gmsh_IO
    - Act on id to name maps in BoundaryInfo::regenerate_id_sets
    - Selectively remove boundary information after mesh stitching
    - Add nodes into nodesets in build_cube
    - Add set names from other mesh when stitching
    - MeshBase reference member in BoundaryInfo changed to pointer
  * Docs
    - Mention "make uninstall" in README.md
    - Update Elem documentation with reference coordinate intervals.
    - Update DenseMatrix docs
    - Add more verbose documentation for InfFE constraints
    - Improve comments on AMR with InfElem.
    - Update documentation for intro_ex3, ex4
  * Elem
    - Fix Elem::is_child_on_edge()
    - Add Elem::center_node_on_side()
    - Add Elem::true_centroid(), Elem::vertex_average(), deprecate Elem::centroid()
    - Add optimized Elem::true_centroid() overrides for some Elems
    - Use displacement vectors for relative_fuzzy_equals() in has_affine_map() tests
    - Don't connect interior_parents in other meshes
    - Handle interior_parents in connect_families()
    - Assert interior_parent() AMR consistency
    - Use hack_p_level inside set_p_level
    - Sync p refinement flags along with p levels
    - Add Elem::hack_p_level_and_refinement_flag and use in Elem unpack
    - Add Elem::n_permutations(), Elem::permute()
    - Add Elem::swap*nodes helper functions
    - Add Elem::is_singular_node()
    - Deprecate the SideEdge class
    - Use non-allocating build_edge_ptr where possible
    - Add "fill" overload for build_edge_ptr
    - Stop using SideEdge proxies
    - Add const version of build_edge_ptr
    - Add Elem::simple_build_edge_ptr implementation
    - Deprecate the Side class
    - Deprecate attempts to build proxy Side objects
    - Stop building proxy sides by default
    - Set subdomain_id+p_level in all side/edge elems
    - Add Elem::has_invertible_map() and overrides for some elements
  * ExodusIO
    - Support empty sidesets + nodesets in ExodusII
    - Update contrib ExodusII to version 8.11
    - Get exodusII.h include out of our headers
    - Add and use ExodusII_IO_Helper::update()
    - inquire() function signature change, move to anonymous namespace
    - Undef multiple guard macros for Exodus+Nemesis
    - Fix Exodus extra integers unit tests
    - Fix extra_integers read in ExodusII_IO
    - Add support for writing components of CONSTANT MONOMIAL_VEC variables
    - Add ExodusII_IO::get_elem_num_map() and get_node_num_map() APIs
    - Add ExodusII_IO::write_nodeset_data() API
    - Add unit test of writing nodeset data to Exodus file
    - Exodus_II_IO::copy_*_solution(DistMesh) fixes
    - Make ExodusII_IO_Helper::nodal_var_values a map
    - Handle incomplete node and elem var maps
    - Add number of nodes per Elem sanity check
  * FE
    - Fix FE side unit tests with --enable-complex
    - Allow second order L2_LAGRANGE on first order elements
    - Allow arbitrary order L2_HIERARCHIC with arbitrary order elements
    - Change max order for L2 families
    - Rotate FE test meshes after permuting elements
    - Add a cubic to fe_test analytic functions
    - Fix p>2 SIDE_HIERARCHIC second derivatives
    - Permuting edges fixes p=2 SIDE_HIERARCHIC HEX27
    - Disable higher order SIDE_HIERARCHIC on HEX27
    - Add warnings to permute_elements doc
    - Test all FE except HERMITE with permuted elements
    - Add test_permute unit test
    - Non-templated FEMap instantiate shim
    - Add missing PYRAMID14 master point
    - Add Unit tests for SIDE_HIERARCHIC FE
    - Support SIDE_DISCONTINUOUS in projections
    - Add SIDE_HIERARCHIC FE and related enums
    - Add shape functions for NEDELEC_ONE FEs on TET10 mesh elements
  * FEMContext
    - Use vars vectors in GenericProjector functors
    - Use _active_vars in FEMContext calculations
    - Sort FEMContext::_active_vars
    - Optional active_vars in all FEMContext::FEMContext
    - Add active_vars member, accessor to FEMContext
    - Use delegating constructor idiom for FEMContext
    - Raw ALE variables should be protected
    - Fix docs that referred to old example
  * InfFE
    - Disable misc ex15 with --enable-node-constraints
    - Don't test InfFE AMR with ENABLE_NODE_CONSTRAINTS
    - Fix compilation with node constraints + InfFE
    - Update documentation
    - add further virtual_for_inffe-statements
    - add dimension-parameter for decay_deriv
    - correct computation of derivatives for non-affine mapped base
    - correct base_point function for non-affine base
    - add test for inf side
    - add new InfElem test: numerical derivatives
    - change in InfFE::reinit(elem, pts):
    - Add support for InfFE::reinit(side)
    - Adapted tests for infinite elements; added further test-calculations.
    - fix inverse_map in InfFE: for nonaffine base, the intersection was wrong
    - Update misc_ex1, ex14 to new InfFE APIs
    - Change 'child_side' to 'child_base' to reduce confusion.
    - Add test-calc. for infinite elem + AMR
    - Add html documentation for new example
    - Ran bootstrap for the new example
    - Add new example: miscellaneous 15
    - Enable AMR with infinite elements
  * Isogeometric Analysis (IGA)
    - Rational function shapes_need_reinit is true!
    - Test inverse_map on less trivial master points
    - Fix manifold-vs-nodeelem checks
    - testMasterCenters() in IGA unit tests
    - Use gzipped bxt meshes in unit tests
    - Support zipped files with DynaIO
    - Add testProjectionRegression to Dyna unit tests
    - Move BERNSTEIN HEX27 interior DoFs to node
    - DynaIO unit tests on more meshes.
    - Do some regression testing on IGA projections
    - Process constraints when DynaIO adds them
    - Do *not* sync done_saving_ids across processors
    - Deprecate SparsityPattern::Build direct access
    - solve_for_constrained_dofs for IGA project_vector
    - Added System::solve_for_unconstrained_dofs
    - Allow belated System::add_matrix()
    - DofMap::process_mesh_constraint_rows
    - Don't store zero entries in IGA constraint rows
    - DofMap::constrained_sparsity_construction() option
    - Comment on math in solve_for_unconstrained_dofs()
    - Omit add_spline_constraints call in fem_system_ex5
    - Don't call add_spline_constraints in Dyna tests
    - Move spline constraint work from DynaIO to DofMap
    - Use MeshBase constraint_rows in DynaIO
    - Store constraint_rows with a MeshBase
    - Allow renumbering and distributing on IGA meshes
    - delete_remote_elements support for constraint_rows
    - Beginning gather(constraint_rows) work
    - Don't try to redistribute() constraint_rows
    - Remove deleted nodes from Mesh constraint_rows
    - Store mesh constraint_rows by pointer
    - Store elem ids in MeshBase::constraint_rows
    - Default to non-SECOND approximations again
    - Run reduced_basis_ex5 twice, once with .bext mesh
    - Don't try to reserialize a distributed IGA mesh
    - Fix delete_remote_elements constraint erasure
    - Add Twisted_Beam bext file
    - Allow reduced_basis_ex5 to read mesh files
    - Support 1D/2D calculations in reduced_basis_ex5
    - Do not skip NodeElems with constrained DoFs!
    - Use new L2System features in calculator app
    - Support null L2System::input_system
    - Support multi-dimensional meshes in L2system
    - Add subdomains_list to apps L2system
  * Mesh
    - Include unpartitioned elements in MeshBase::subdomain_ids
    - Allow Elem, Node re-insert in ReplicatedMesh
    - Move MeshCommunication::*gather to MeshBase
    - Implement mesh move constructors in terms of MeshBase::assign() function
    - Add more verbose output to MeshBase::get_info()
    - Add API to tell mesh it is not prepared
    - Deprecate public MeshBase::boundary_info member
    - Add global data structures for mesh subdomain and boundary ids
  * MeshFunction
    - Add MeshFunction copy constructor; implement MeshFunction clone() in terms of this
    - MeshFunction::set_point_locator_tolerance(): set both PointLocator tolerances
    - MeshFunction: use unique_ptr to manage PointLocator
    - Add non-const accessor for underlying PointLocator
  * Misc. bugfixes and improvements
    - Ghost periodic point neighbors in GhostPointNeighbors
    - Add MeshInput::is_parallel_format() accessor
    - Update contrib version of Eigen to 3.3.9
    - Update contrib version of lcov to 1.15
    - Upgrade TIMPI to 1.7.0_bootstrapped
    - Update MetaPhysicL to 1.1.0_bootstrapped
    - Add TypeVector overloads for std::norm and friends for Eigen::Matrix
    - Add support for exchanging adjoint physics
    - System: store unique_ptrs in _vectors map
    - Add copy assignment+constructor for ParsedFunction and unit tests
    - Move basic matrix storage and create virtual matrix APIs in System
    - Add InterMeshProjection class to handle arbitrary projections between meshes
    - PointLocatorTree: use std::shared_ptr to manage tree
    - Add new PointLocator derived class based on Nanoflann
    - Don't try to autodetect headers for tecio in system locations
    - Add nodal quadrature rules for Pyramids
    - Add MeshModification::permute_elements()
    - Officially deprecate UniquePtr
    - Improve performance of BoundingBox::contains_point() by inlining it
    - Add chunked_mapvector, a variant of mapvector that tries to improve performance
    - Mimic STL and boost constructors in our allocators
    - DofMap: add const DofConstraints accessor
    - Fix --disable-amr builds
    - Fix --enable-all-static builds
    - fparser: update deprecated throw specifications
    - Fix BC issue in systems_of_equations_ex8
    - Create multi_evaluable predicate
    - Add Elem::affine_tol and use in has_affine_map comparison tests
    - Disable HDF5 file locking unless the user insists
    - Set next unique id in copy_nodes_and_elements
    - PointLocatorTree: avoid Elem::contains_point() warning when using custom tolerances
    - Updates to C++11/14/17 configure tests
    - Fix compilation with both CAPNP and GLPK enabled
    - Turn off gdb backtraces by default
    - Add and test Dense{Vector,Matrix} std::initializer_list constructors
    - Add configure test for C++11 <initializer_list> header
    - Avoid allocating sparse matrix when using JFNK
    - Fix leak in merge_ghost_functor_outputs
    - Detect if PETSc has strumpack
    - Add local_singular_node to Elem for catching singular nodes in inverse_map
    - Add bounding box scaling
    - Remove potential deadlock with Singletons and RemoteElem
    - DofMap::distribute_dofs() now returns the total number of DOFs across all procs
    - Drop SHA1 lib, use std::hash instead
    - Add EDGE4 case to get_refspace_nodes
    - Use RAII to clean up some PETSc objects with WrappedPetsc<T>
    - Don't potentially throw from 'exceptionless' error macros
    - Make ReferenceCounter::increment_{de,con}structor_count() noexcept
    - Re-enable check_dirichlet_bcid_consistency
    - Move linear_solver member from LinearImplicitSystem to ImplicitSystem
    - ImplicitSystem::get_linear_solver() now throws an error
    - UnsteadySolver: old_local_nonlinear_solution is now a std::shared_ptr
    - PeriodicBoundaries now stores unique_ptrs instead of dumb ptrs
    - Fix scatter for node constraints
    - Add some vector CompareTypes
    - Fix possible overflow in PeriodicBoundaries::neighbor
    - Ignore remote elems coming from pbcs in DefaultCoupling
    - ParsedFEMFunction: change "parsers" to a vector of unique_ptrs
    - Generalize default constructors for TypeTensor and TypeVector
  * NemesisIO
    - Support Nemesis writes of complex-valued elem data
    - Unit tests for Nemesis::copy_elemental_solution
    - Add Nemesis copy_nodal_solution unit tests
    - Allow testing Exodus copy_*_solution distributed
    - Test Exodus+Nemesis both replicated+distributed
    - Factor Exodus/Nemesis into separate unit tests
    - NemesisIO::copy_nodal_solution
    - Use NemesisIO::read even on one processor
    - Manually set unique_id in NemesisIO
    - Keep internal node_num_map one-based in Nemesis_IO
    - Nemesis_IO::get_nodal_var_names()
    - Unit test for NemesisIO write_equation_systems
    - Handle empty node intersections
    - Write Nemesis cmaps even if they're empty
    - NemesisIO::assert_symmetric_cmaps() refactoring
    - NemesisIO::write_nodal_solution subparametric case
    - Implement NemesisIO(ReplicatedMesh&)
    - Test Nemesis read for arbitrary MeshType
    - Add testNemesisRead() unit test
    - Fix off-by-one errors in Nemesis_IO
    - Remove Nemesis_IO_Helper::put_n_coord
    - Remove Nemesis_IO_Helper::create
    - Fixes for --disable-nemesis builds
    - Fix NemesisIO Hex27 output issue
  * NumericVector
    - Add virtual NumericVector::max_allowed_id() API.
    - Generalize multi-vector operations to always use global forms
    - NumericVector: Make indexing add/set operations toggle _is_closed
    - DistributedVector GHOSTED in serial can be SERIAL
    - Read/write numeric vector projection/type info
  * Partitioner
    - Use Partitioner::build with command line override
    - Add/use Partitioner::build(PartitionerType) with command line override
    - Add PartitionerType enum
    - Fix SFC Partitioner on distributed meshes
  * Reduced Basis
    - Enable plotting of EIM functions
    - Updates to RBConstruction truth solve outputs
    - RBConstruction: Handle exceptions thrown during assembly
    - Add observation values to EIM
    - Update rb_data.capnp and serialization/deserialization support for EIM observation values
    - Add _preserve_rb_eim_solutions flag to RBEIMEvaluation
    - Made eim_solutions_for_training_set private with getters in RBEIMEvaluation
    - Cleanup of RBEIMConstruction
    - Skip reinit when there are no DOFs on Elem
    - Enable eim-best-fit with lookup table
    - Add set_EIM_rhs_vec() to RBEIMEvaluation
  * SparseMatrix
    - Fix memory issue for matrix_matrix_mult and add option for reusing matrix
    - Add PetscMatrix::create_submatrix_nosort()
    - Add PetscMatrix::add_sparse_matrix()
    - Fix PetscMatrix::matrix_matrix_mult()
    - Fix PetscMatrix::print_personal()
    - Add LumpedMassMatrix
  * SparsityPattern
    - Add comments to SparsityPattern::Build methods
    - default+delete SparsityPattern::Build functions
    - Use SparsityPattern for n_nz in SparseMatrix
    - Make DofMap::build_sparsity() public
    - DofMap::get_sparsity_pattern() accessor
    - Keep n_nz and n_oz in SparsityPattern::Build
    - Use new SparsityPatternBuild accessors in DofMap
    - More SparsityPattern::Build methods
    - Add SparsityPattern::build accessors, reorganize
    - Remove SparsityPattern::Build::mesh
    - Remove non-unique DOF ids in Build::sorted_connected_dofs()

1.6.1 -> 1.6.2
  * Mimic stl and boost constructors in our allocators
  * Weaken partitioner_test for SFC on 8+ processors
  * Fix for deprecated warning in SLEPc not-quite-3.15
  * fix typo in type_to_n_nodes_map
  * amended solver_types
  * set constant 0 to float
  * Fix example doc and combine if-statements
  * Fix docs that referred to old example
  * Update docs for named boundary (side, edge, node) sets.
  * Make RadialBasisInterpolation quiet
  * misc_ex13: fix doc string
  * Prerequest nothing on side FE in RB ex2
  * libmesh_cast_ptr -> cast_ptr in example
  * Fix deprecated warnings in SLEPc 3.15
  * Add missing PYRAMID14 master point
  * Don't try to autodetect headers for tecio in system
  * Wrap Petsc include for dmimpl.h in ignore and restore warnings.
  * undef MAJOR_VERSION and MINOR_VERSION before including petsc.h in config tests
  * Fix for --enable-petsc-required
  * Fix nodes_on_edge for 2nd order InfCell cases
  * Fix Elem::is_child_on_edge
  * Fix asserts in PetscMatrix::add_sparse_matrix()
  * Fix residual history vector pointer constness in newer PETSc versions

1.6.0 -> 1.6.1
  * Do *not* sync done_saving_ids across processors
  * Fix compilation with both CAPNP and GLPK enabled
  * Re-reserve non-zero pattern after Eigen::setZero
  * Generalize default constructors for TypeTensor and TypeVector
  * Make ReferenceCounter::increment_{de,con}structor_count() noexcept
  * Work around warnings in system xdr/rpc headers
  * Don't try to cast ostream to bool
  * Remove potential deadlock with Singletons and RemoteElem
  * Fix NemesisIO Hex27 output issue
  * Fix SFC Partitioner on distributed meshes
  * Don't apply a regex to the string "All Tests"
  * Remove non-unique DOF ids in Build::sorted_connected_dofs()
  * Initialize next_unpartitioned_unique_id
  * Eliminate leak in merge_ghost_functor_outputs
  * The SHAPE and SKEW metrics for Quad elements should have similar bounds.
  * Turn off gdb backtraces by default

1.5.1 -> 1.6.0
  * Exodus/Nemesis
    - Add MappedOutputVector/MappedInputVector classes for single-precision I/O
    - Add support for reading edgesets
    - Improve ElementMaps and reduce copy/paste bolierplate
    - Call newer exII::ex_put_concat_all_blocks(), ex_get_block(), ex_get_ids(), etc. APIs
    - Avoid unnecessary localize in Nemesis write_nodal_data()
    - Better error message when invalid node id is found in nodeset
    - Handle complex variables in write_element_data_from_discontinuous_nodal_data()
    - Make writing the complex modulus optional
    - Add capability to load elemental variables into element IDs
    - Add ExodusII_IO::read_header() and unit test
    - Respect empty output names in NemesisIO
    - Fixes for appending to Nemesis files
    - Preserve ordering of nodal variables in NemesisIO
    - Explicitly delete copy/move assignment operators in ExodusII_IO_Helper
    - Add support for reading nodeset variables
  * Add DiagonalMatrix, a SparseMatrix which uses a NumericVector for storage
  * FEMap
    - Put mapping methods into mapping classes
    - Move MappingType out of Elem
    - Add first rational mapping unit test
    - Respect non-LAGRANGE maps with C1 elements
  * FE
    - Remove some explicit instantiations and related macros
    - Refactor/optimize 1D Lagrange shape(), shape_deriv(), shape_second_deriv() calls
    - Add second derivatives for Bernstein FEs
    - Add some FE tests at fourth order
    - Allow GenericProjector to work with vector finite elements
    - InfFE: Add new shape()-API; Change API for shape_ptr and its derivs
    - Skip redundant resize in init_shape_functions
    - Add FE::shape_derivs(), shapes(), all_shapes() APIs
    - Extend FEMap optimizations to 0D+1D+2D
    - Explicitly use FEAbstract::get_nothing() to avoid all FE computations
    - Add 'extra_checks' parameter to FEMap::inverse_map()
    - Add dual shape functions (dual_phi, dual_dphi, and dual_d2phi) in FEBase
    - Add new FEInterface::n_dofs() APIs taking Elem pointers
    - Add new FEInterface::n_dofs_at_node() APIs taking Elem pointers
    - Add new FEInterface::n_dofs_per_elem() APIs taking Elem pointers
    - Add new FEInterface::n_shape_functions() APIs taking Elem pointers
    - Add new FEInterface::shape() APIs taking Elem pointers
    - Add new FEInterface::ifem_ APIs taking Elem pointers
  * Add unit tests for !contains_point()
  * Add/use libmesh_map_find() macro
  * Add/use libmesh_vector_at() macro
  * DynaIO
    - Add mesh reader for BEXT files
    - Add unit test of reading 25-element patch file
    - Add DynaIO::add_spline_constraints() and unit test
  * Add/set SNES divergence tolerance
  * Separate headers string_to_enum.h and enum_to_string.h
  * Reduced Basis
    - Added an option to use the energy inner-product
    - Updates for reduced_basis_ex7
    - Uncomment RBConstruction::compute_residual_dual_norm_slow() for debugging
    - Added extra error checking in rb_data_deserialization.C
    - RBConstruction: Add post processing callbacks
    - Skip enrichment if RHS norm is exactly 0
    - Add support for POD training in RBConstruction
    - Update RBConstructionBase<Base>::generate_training_parameters_deterministic()
    - Update TransientRBConstruction to not use lapack calls directly
    - RBEIMConstruction: Move FE getter calls outside elem loop
    - Skip NODEELEMs in assembly
    - Add RBEIMConstruction::init_context() override
    - Update to post_process_elem_matrix_and_vector() in RBConstruction
    - RBConstruction update to store an untransformed basis
    - Optionally pre-evalaute theta functions for efficiency
    - Fix wrong function call syntax in rb_data_deserialization.C
    - Evaluate theta functions at multiple parameters simultaneously
    - Early return when there are no training samples
    - Major refresh of the EIM framework
    - Add support for defining RBParametrizedFunctions based on a look-up table
    - Deprecate {RBParameters,RBParametrized}::get_parameter_names()
  * Xdr
    - Efficiency improvments: restrict iteration, handle ids while parsing
    - Reset stream precision after writing an integral value
    - Add unit test of Xdr::data(vector)
    - Fix access past end of vector in data_stream() implementations
  * Update Tetgen to version 1.5.1
  * Mesh
    - Additional options for adding extra integers+data
    - Merge extra integers during copies+submeshes
    - Add MeshBase::add_elem(std::unique_ptr<Elem>)
    - Add MeshRefinement::add_elem(unique_ptr)
    - Add MeshBase::insert_elem(std::unique_ptr<Elem>)
    - Add MeshBase::add_node(std::unique_ptr<Node>)
    - Add MeshBase::insert_node(std::unique_ptr<Node>)
    - Add MeshBase::remove_orphaned_nodes()
    - Unit tests for MeshTools::Generation::build_cube()
    - Reset ReplicatedMesh::_n_* during clear()
    - Many DistributedMesh unique id fixes
    - MeshGeneration::build_sphere() DistributedMesh fixes and unit tests
    - Use max_node_id to size vectors indexed by node id
    - Updates to allow_find_neighbors(true) in prepare_for_use(), find_neighbors()
    - allgather() before falling back on Metis
    - Preserve extra ints and mapping data in flatten(), all_second_order(), create_submesh(), etc.
  * AbaqusIO
    - Read .inp files with *Surface sections referring to element sets
    - Add string_to_num(), strip_ws() helper functions
    - Add support for "MASS" elements and "NODE" sidesets
  * TIMPI
    - Move parallel* files into contrib/TIMPI submodule
    - Use push_parallel_packed_range() in scatter_constraints
    - Use TIMPI::communicator to merge LibMeshInit APIs
    - Use Communicator::duplicate() correctly
  * Allow adaptivity_ex3 to run with more variables
  * Misc. bugfixes
    - Fixes for compilation with PETSc enabled, MPI disabled
    - Copy point locator tolerance in MeshFunction::clone()
    - Threading: OverlappingCouplingFunctor, MeshFunction, Clough-Tocher, etc.
    - Sync nodes after all_second_order if not replicated
    - Add missing PYRAMID cases to l2_lagrange_n_dofs()
    - Fixes for --disable-second and other less common build configurations
    - Fix all_second_order() for DistributedMesh
    - Don't try to enable ParMETIS without METIS
    - Add check for nearly coincident nodes when stitching
    - Call enforce_constraints_on_residual() using local solution
    - Do GHOSTED localizes to ghosted vectors
    - Split scraping of PETSc configure and testing the PETSc installation for viability
    - Fixes for DistributedMesh unique_id generation
    - Fix reverse iterator usage bug in adjoint AMR constraints
    - DofMap::add_constraint_row(): assert there is no diagonal entry
    - Fix parallel_ghost_sync.h for N->M operations
    - Switch boost includes from -I to -isystem to ignore warnings
    - Fix valgrind issue with VecSetDM
    - Non-proxy sides now have same p_level() as Elem they are built from
    - Use std::stable_sort in CentroidPartitioner
    - parmetis.m4: Fix potential uninitialized variable
    - Avoid calling DofObject::id() when id can be invalid
    - Bugfix for sparse QoI constraint cases
    - Associate a mesh when adding GhostingFunctor to DofMap
    - PeriodicBoundaries fixes for "sharktooth" meshes
    - Disambiguating Node constructor should be marked explicit
    - Fix subdomain expansion with element DoFs
    - Fix indexing in EquationSystems::get_vars_active_subdomains()
    - ParsedFunction and ParsedFEMFunction no longer store vectors of
      FunctionParserADBase<T> since that class is not MoveInsertible
    - Ignore remote elems coming from pbcs in DefaultCoupling
    - Rational function shapes_need_reinit is true!
    - Delete MeshBase and derived class' move constructors
    - Fixes for unit tests in non-standard configurations
    - Fix "make install" issue where it was possible to get interactive mv questions
    - Move BERNSTEIN HEX27 interior DoFs to node
  * pkgconfig
    - Remove extra flags from pkgconfig Cflags
    - Conditionally add libmesh-*.pc files based on METHODS
  * VTK
    - Fix mesh reference in VTKIO write
    - Try linking to VTK CommonExecutionModel too
    - Set data mode to binary when _compress is true
  * BoundaryInfo
    - Add BoundaryInfo::remove_node(node, id)
    - Fix outdated docs
    - Add BoundaryInfo::erase_if() helper function
    - Add BoundaryInfo::NodeBCTuple typedef
    - Control sorting method used in build_node_list(), build_side_list()
    - add_elements(): Add flag controlling setting of parent side ids
    - Copy name maps in BoundaryInfo::operator=
    - Clear BoundaryInfo set names during clear()
    - Add methods to synchronize side boundary ids on the fly
  * PETSc/SLEPc
    - Add support for shell matrices in SLEPc eigenvalue solver
    - Use MAT_INPLACE_MATRIX in newer PETSc versions
    - Remove support for PETSc < 3.5.x
    - Additional PETSc install variant detection
    - Allow third-party non-PETSc METIS
    - PetscSolverException: use specific error message if available
    - Updates to support PETSC 3.13
    - Add API to retrieve only eigenvalue when eigenvector is not needed
    - Add support for shell preconditioning matrix in EigenSystem
    - Add sparse matrix-matrix multiplication and addition
    - Check whether nonlinear residual vector and base vector pointers are equal
    - Improve EigenSolver initial guess setup
  * Add ExactSolution::set_excluded_subdomains() API
  * C++ modernization
    - Add configure test for and use std::make_shared in library
    - Replace more calls to "new" with std::make_shared, libmesh_make_unique
    - IntRange helper functions: index_range(), make_range()
    - Use range-based for-loops wherever possible
    - Add/use vectormap::emplace()
    - Add configure tests for std container emplace functions
    - Prefer emplace() to insert() for std containers
    - Add configure tests for std container emplace_hint()
    - Use std::reference_wrapper in several examples
  * Use lower-order quadrature in JumpErrorEstimator
  * Tree::find_elements() optimizations
  * FParser
    - Refactor and make JIT code modular
    - Update diagnostic pragmas
    - eval_mixed_derivatives, eval_at_point skip_context
    - Fix JIT disabling
    - Disable derivative caching
    - Refactor compiled function pointer and pImmed update
    - Fix value return in JIT function
  * PointLocator: Add tolerance for finding elements
  * Add ParallelType to ImplicitSystem::add_matrix() API
  * Add fem_system_ex5 demonstrating IGA
  * DenseMatrix: Use helper struct to determine whether to use blas_lapack
  * Elem
    - Copy Elem interior parents during copy construction
    - Add Elem::local_side_node()
    - Add Elem::local_edge_node()
    - Add edge to side map for all Cell-derived types
    - Make Edge3::volume() calculation more robust and add unit tests
    - Add Quad::quality(TWIST) unit test
    - Add Tri::quality(SHAPE) metric
    - Elem::simple_build_side_ptr() returning unique_ptr
    - Quad4::build_side_ptr() should call simple_build_side_ptr()
    - Optimize Elem::find_point_neighbors()
    - Add geometric constants for Edge-derived elems
  * Add SparseMatrix::clone(), zero_clone() and derived class implementations
  * PointLocator: fix BoundingBox intersection test for QuadTree
  * Add FileSolutionHistory and test in existing example
  * Add DirichletBoundary copy assignment operator
  * Add multi-file support to meshtool app
  * QGaussLobatto: add fallback on regular Gauss quadrature
  * Move some m4 files into an autoconf-submodule for sharing between different projects
  * Make "NumericVector localize()" scalable when possible
  * Add Lagrange-specific code path to ConstrainDirichlet
  * Clean up of deprecated code, support for --disable-deprecated builds
  * Clean up strip_dup_libs.pl script which sorts/modifies the list of linker libraries
  * TwoStepTimeSolver: add adjoint support
  * Add/use libmesh_error_msg_if() macro
  * Inline a more efficient implementation of BoundingBox::intersects()
  * Add html documentation for several of the newer examples
  * Fixes for node balancing algorithms during partitioning
  * GhostPointNeighbors optimizations

1.5.2 -> 1.5.3
  * Fix standalone header bug introduced in 1.5.2

1.5.1 -> 1.5.2
  * Cherry-pick following commit from 1.6.0 branch and fix merge conflicts
    d25f5ad57 Combination of MoveInsertable fixes (#2170)

1.5.0 -> 1.5.1
  * Fix compilation with --enable-petsc --disable-mpi
  * Fix multithreading bugs in MeshFunction, GenericProjector, tests
  * Fix configure summary CPPFLAGS output
  * Fix consistency of --enable-curl with NetCDF
  * Fix bug in Triangle interface

1.4.1 -> 1.5.0
  * Write Exodus files in netCDF-4 format when HDF5 is available.
  * Add left multiply (by vector) method to type_tensor
  * Update bundled netCDF from version 4.4.1.1 to 4.6.2, remove netCDF-3 source.
  * Handle different combinations of METIS/ParMETIS in PETSc.
  * Add --enable-capnp-required configure option.
  * Add surface-terms and gradients to misc_ex14.
  * Infinite elements fixes
    -Dimension of the local_transform object corrected
    -Allow infinite elements in System::point_gradient()
    -Fixed diagonal in InfHex::contains_point()
    -Reorganisation in InfFE::init_face_shape_functions()
    -Fix memory leak in inf_fe_boundary.C
    -Replace unrolled loops in legendre_eval() and jacobi_eval().
  * Add _extra_parameters map to RBParameters.
  * Add support for PETSc GMG (Boris Boutkov).
    -Support complex numbers.
    -Unit test coverage.
  * ReplicatedMesh::add_elem(): fix missing unique id update.
  * Add ability to skip "non-critical" partitioning when updating mesh.
  * configure:
    -match PETSc 64/32-bit index sizes when possible instead of throwing an error.
    -Support SLEPC installed by PETSc.
  * Bug fix: Close residual/vector before applying constraints.
  * Run fem_sys_ex1 with GMG+FS options.
  * Add is_zero() to TypeVector and TypeTensor.
  * Bug fix: FEInterface::get_continuity() should take a const reference.
  * Add DofMap::swap_dof_constraints() API.
  * Add subdomain iteration range objects
    -active_subdomain_set_elements_ptr_range
    -active_subdomain_elements_ptr_range
    -active_local_subdomain_elements_ptr_range
  * GmshIO:
    -Add support for reading gmsh-4 files.
    -Enable reading of meshes with a mix of 1, 2, and 3D elements.
  * Drop VecScatterCreateWithData() workaround. This PETSc rename did not happen.
  * Add non-blocking exchange (NBX) for pushing/pulling data.
  * DenseMatrix:
    -Add support for DualNumber.
    -Add DenseMatrix::sub_matrix().
  * Add outer product for TypeVectors.
  * Fix remote_elem copying in UnstructuredMesh.
  * Add OverlappingCoupling GhostingFunctor, unit tests.
  * Fix 2006 bug with refinement within ES::reinit().
  * Bug fix: Don't constrain hanging nodes at variable boundary.
  * Rewrite GenericProjector
    -Add Lagrange interpolation optimization.
    -Fix threading.
    -Add unit tests.
  * Add "extra integers" support.
    -MeshBase::get_*_integer_index API
    -MeshBase::add_elem_integer() API
    -MeshBase::add_node_integer() API
    -Add Systems with extra integers.
    -Unit tests
    -CheckpointIO support
  * Bug fix: Improve NodeElem support in ReplicatedMesh::stitch_meshes().
  * Add FEMContext::interior_rate_gradient().
  * Drop long-deprecated Elem APIs.
    -Elem::node()
    -Elem::get_node()
    -Elem::neighbor()
    -Elem::side()
    -Elem::build_side()
    -Elem::build_edge()
    -Elem::child()
  * Bug fix: DofMap::local_variable_indices().
  * Several contrib/metaphysicl submodule updates (latest is 0.6.0)
  * ExodusII_IO:
    -Fix indexing issue in read_elemental_var_values().
    -Improve support for scalar variables.
    -Read/write all nodesets simultaneously.
    -Use nodal map when reading nodal variables.
    -Add read_sideset_data()
    -Add write_sideset_data()
  * Bug fix: avoid NaNs in block restricted vector variables when using PETSc 3.8.3
  * Improve diagnostic message when cpr header can't be opened.
  * Add Communicator::split_by_type(), unit tests.
  * Add support for PETSc-3.11.x.
  * Quadrature:
    -Don't pass p_level and type as parameters, use class members.
    -Use get_order() everywhere instead of passing p_level.
    -Add QNodal quadrature class.
    -Fix const correctness issue in QJacobi.
    -Fix some hard-coded long double precision literals.
    -More digits for SEVENTH-order quadrature on TRIs.
  * Always add block size for petsc matrix.
  * Bug fix: Explicitly call SubFunctor::join() in SortAndCopy::join().
  * Re-enable misc ex9 on non-PETSc builds.
  * Switch signs of on-diagonal and off-diagonal entries for constraints.
  * Ignore -Wstack-protector warnings in 3rd party code.
  * Add LOG_SCOPE_WITH macro, supports use of custom PerfLogs.
  * Bug fix: Clear old SLEPc solver before solving again.
  * Bug fix: PointLocatorTree had bad definition of is_planar_xy
  * PetscMatrix:
    -Add local_m()
    -Add local_n()
    -Add get_local_size()
    -Add reset_preallocation()
    -Make mallocs uniformly an error.
  * NumericVector: Add component-wise multiplication operator *=
  * TriangleIO improvements:
    -Add functions with a unit test for creating a hole from a mesh
    -Regions support, toggle Triangle prints
    -Add boundary marker capability
    -Support disconnected enclosures
  * Bug fix: Elem::second_order_equivalent_type().
  * Generalize subdomain comparison for var groups.
  * Add FEMContext::set_jacobian_tolerance().
  * Bug fix: Avoid dangling reference in SparsityPattern::Build
  * Bug fix: In FEMap, set 'failing' back to false after print_info().
  * Add libmesh_cppunit.h file with unit test boilerplate to unit tests directory.
  * Add/improve support for Real == float128 via boost::multiprecision.
  * Add MONOMIAL_VEC fe type and associated example.
  * Add DofObject::get/set_extra_datum(), non-integer DofObject data.
  * If we build METIS ourselves, then install metis.h.
  * Bug fix: Set the correct MPI communicator in VTKIO.
  * Pedantic debugging flags are now *disabled* by default, use
    --enable-glibcxx-debugging to turn them back on.
  * Big header file refactoring, reduce header dependencies as much as possible.
  * Bug fix: FEXYZ::shape_deriv() of phi_1 in 1D was wrong.
  * Add RATIONAL_BERNSTEIN FEType.
  * Allow TRI3SUBDIVISION elements in more quadrature rules.

1.4.1 -> 1.4.2
  * Cherry-pick following commit from 1.6.0 branch and fix merge conflicts
    d25f5ad57 Combination of MoveInsertable fixes (#2170)
  * Cherry-pick b3e1c10d6 to fix compilation with recent versions of PETSc

1.4.0 -> 1.4.1
  * This is a bugfix release for 1.4.0.
  * Correctly identify automake 1.15 as too old
  * Close residual/vector before applying constraints
  * Capture iterations from PETSc in DiffSolver
  * Fix 2006 bug with refinement within ES::reinit()
  * Fix remote_elem copying in UnstructuredMesh
  * Fix issue with subdomain-restricted variables and hanging nodes (#2099)
  * Drop VecScatterCreateWithData() workaround. This did not end up making
    it into a release version of PETSc.
  * Fix doco in DenseMatrix::right_multiply.
  * FEInterface::get_continuity() should take a const reference.
  * Fix complex-enabled bug in unit test.
  * Fixes for mesh stitching when NodeElems are involved.
  * Remove deprecated Elem API calls from misc_ex6.
  * Assert consistent ErrorVector values for flagging.
  * Restrict adaptivity ex3 max_r_steps.

1.3.1 -> 1.4.0
  * BoundaryInfo:
    - BoundaryInfo::build_foo_list(): sort vector before returning.
    - Warn if user tries to add a boundary id for a non-existent node.
    - Add std::tuple-enabled versions of various BoundaryInfo functions
      (originals are now deprecated).
  * BoundingBox:
    - Add BoundingBox::signed_distance().
    - Add "fuzzy" BoundingBox::intersects() function.
  * C++11 updates.
    - Prefer vector::data() to &v[0].
    - Use C++11 iterator-returning erase member functions when possible
    - Test for and use C++11 std::iota
    - Add configure test for std containers with iterating-returning erase.
    - Require and test for C++11 std::begin/end support for C arrays.
    - C++11 decltype support is now required.
    - Default/delete copy/move constructors and assignment operators
      in various classes; add unit tests.
    - Switch all enumerations to "fixed type" enums with underlying type int.
    - Drop usage of libmesh_nullptr, libmesh_final, libmesh_override etc. from library.
  * Compiler support:
    - Fix trailing return type issue affecting GCC 7.1
    - Fix Intel warnings
    - Fix warnings discovered in GCC 8.1 and clang 6.1.
    - Fix ptrdiff_t/ std::ptrdiff_t incompatibility issue.
  * configure tests:
    - Many updates to m4 tests including use of standardized autoconf
      macros like AS_IF, AS_CASE, etc.
    - Fix bug in Trilinos DTK configure test.
    - Fix cppunit test, cppunit-config is no longer distributed with cppunit.
    - Apply -march/mtune flag when profiling as well.
    - Add configure option for turning on/off -Werror.
    - Add configure option --enable-paranoid-warnings.
    - Add --disable-deprecated configure flag and remove deprecated code.
    - Update docs for processor_id_type, the default size is now 4 bytes.
    - 1D/2D-only fixes
    - Disable HDF5 detection by default.
    - Improve support for PGI compiler
    - Add support for --enable-march and --with-gcc-arch.
    - configure: detect when PETSc is built with support for different partitioners
    - Remove --enable-default-comm-world configure option.
    - threads.m4: Only error if user requested TBB and it wasn't available.
  * DofMap:
    - eval_old_dofs needs var, not var_component
    - Fix local_variable_indices numbering assumption and add unit test.
    - Different constraint enforcement for hanging nodes
    - Avoid calling set_dof_coupling() with an empty/non-nullptr CouplingMatrix.
    - Add unit test for DofCoupling with variable groups.
    - Add optimized DofObject::dof_number() overload.
    - Fix copy/paste bug in DofMap::add_neighbors_to_send_list().
    - Allow linear transformations between boundaries for periodic BCs with vector variables.
    - Support adjacent/overlapping periodic boundary conditions.
    - Optimizations/fixes to SparsityPattern::Build::parallel_sync().
    - Fix adaptivity bug in which Elements w/o neighbors were treated as unrefined islands.
  * FE:
    - Add const accessor methods for psi map second derivatives.
    - Add const accessor methods for dpsi_maps in FEMap.
    - Allow user-defined tolerance for negative Jacobian failures.
    - Fix FEInterface bug in which wrong FEType was passed to
      shape()/shape_deriv() calls.
    - Combine HIERARCHIC/L2_HIERARCHIC and LAGRANGE/L2_LAGRANGE shape
      function implementations.
    - Enable base-side in InfFE::reinit(elem, side)
    - Add unit test demonstrating DGFEMContext assembly.
  * for loops:
    - Add index_range() helper function for vector loops.
    - Convert many traditional for-loops into range-based for loops.
    - Remove many lines of iterator boilerplate.
    - Cache n_processors() rather than calling it every loop iteration.
  * GhostingFunctors
    - Add ability to disable default GhostingFunctors.
    - Drop one more over-zealous assert when removing GhostingFunctors.
    - Miscellaneous GhostingFunctor iteration optimizations.
    - Use unordered_set in GhostPointNeighbors functor.
    - Don't assert GhostingFunctor presence before removing.
  * Elem:
    - Add "filling" overloads for side_ptr(), build_side_ptr().
    - Add unit tests for Elem::simple_side_ptr().
    - Add non-const returning versions of Elem::family_tree_ functions.
    - Mark methods final in Elem subclass superclasses.
    - Mark new side_ptr functions override to avoid warnings.
    - Use stack arrays in Elem::operator==,key() instead of heap vectors.
    - Simplify loose_bounding_box for 'bi/tri/linear' elements.
    - Add Elem::nodes_on_side() utility function
  * Mesh:
    - Use only one search in DistributedMesh::add_point()
    - Replace buggy "binary search" algorithm with nanoflann-based
      algorithm in ReplicatedMesh::stitching_helper().
    - Fix failure to sync nodes in some AMR cases
    - Fix for --disable-amr builds.
    - Move UnstructuredMesh::all_{first,second}_order() functions to correct C file.
    - Add version of MeshTools::build_nodes_to_elem_map() that builds a std::unordered_map.
    - LaplaceMeshSmoother: restrict smoothing to specified subdomains.
    - MeshTools::find_boundary_nodes: Add overload that builds a std::set.
    - Fix bug in Evaluable multi-predicate.
    - Fix overzealous assertion in UnstructuredMesh::copy_nodes_and_elements()
      by wrapping proc ids.
    - Add asserts to various MeshTools utilities for DistributedMesh use cases.
  * Mesh I/O:
    - Acquire BC lists outside the CheckPointIO id loop (optimization).
    - ExodusII_IO: Add ability to write more general discontinuous data.
    - ExodusII_IO: Fix issue where hide_output() flag was not respected.
    - AbaqusIO: support more element type strings.
    - NemesisIO: various fixes for writing/reading communication maps (cmaps).
    - NemesisIO: add ability to plot ErrorVector.
    - Fix bug when writing discontinuous ExodusII files with subdomain-restricted variables.
    - Add support for elemental variable writing in Nemeis.
    - Fix indexing bug in Nemesis variable hiding code.
    - ExodusII_IO: skip writing elemental variables on inactive blocks.
    - Fixed bug in discontinuous plotting with Exodus format.
    - Fix Exodus solution writing for meshes with node numbering gaps.
    - XdrIO::write meshes with discontiguous node ids.
    - Improve/generalize configure test for XDR headers.
  * MetaPhysicL
    - MetaPhysicL is now a git submodule in libmesh. If you configure libmesh
      with --enable-metaphysicl, use the submodule version of metaphysicl for
      best results.
    - Add --enable-metaphysicl-required configure option.
  * Partitioners:
    - Fix LinearPartitioner on small distributed meshes
    - Fix buffer overrun in Hilbert SFC Partitioner.
    - Add Partitioner unit tests.
    - Add support for different node partitioning strategies
    - Allow partitioners to refer to the "original" based on the new local ordering.
    - Generalizations to ParmetisPartitioner required for idaholab/moose#11629.
    - Factor out Node::choose_processor_id heuristic.
    - Tweaks to the way that newly created nodes are partitioned.
    - Define USE_GKRAND when building Metis. This is consistent with PETSc's METIS.
    - Don't use LIBMESH_TLS in contrib/metis. This is consistent with PETSc's METIS.
  * Numerics:
    - Laspack fixes
    - Move TypeVector::unit into the header.
    - Fix issue with constness in LaspackMatrix::add().
    - SparseMatrix::add() ref should be const
    - Add new PetscNonlinearSolver interface: set_snesmf_reuse_base().
    - Make SparseMatrix::add() const correct.
    - Add DualNumber to libMesh::CompareTypes
    - Avoid modifying solution vector in TaoOptimizationSolver callbacks.
    - Add LibMeshVecScatterCreate macro, maintain compatibility with PETSc master.
    - PetscMatrix: Add support for MATHYPRE, MatHYPRESetPreallocation.
    - Avoid use of MATHYPRE when Hypre is not available or PETSc is too old.
    - Disable Trilinos when configured with --with-dof-id-bytes=8
    - Add typedef'd index_type in TypeVector, TypeTensor, TypeNTensor.
    - Change return type of TypeTensor::operator*
    - TypeVector/TypeTensor: make default constructors public.
    - TypeTensor: Add operator*=(TypeTenosr&).
    - Fix bug with --enable-petsc-hypre-required when PETSc is not found.
    - Add PetscDMWrapper for eventual geometric multigrid support.
    - Add --require-petsc-hypre configure option.
    - NumericVector::operator/= argument is now const reference.
  * Parallel:
    - Fix bug in Parallel::minloc/maxloc.
    - The libmesh_call_mpi() macro now includes #ifdef LIBMESH_HAVE_MPI checks.
    - Add PostWaitDereferenceSharedPtr/nonblocking_receive_packed_range().
    - Fix MPI Datatype leaks (again).
    - Use parallel_sync in Parallel::Sort.
    - Add support for StandardType<Tuple>.
    - Add PostWaitDereferenceTag class and reference counting for MessageTags.
    - Replace old "round-robin" communication algorithm with parallel_sync.
    - Use MessageTag in parallel_sync probe calls.
    - Split include/parallel headers into several files.
    - Drop (attempted) MPI-1 support that was apparently long broken anyway.
  * Examples:
    - Add new example, systems_of_equations_ex9, demonstrating linear
      elasticity with periodic constraints.
    - Run examples in the order: "dbg, devel, oprof, opt"
  * Miscellaneous:
    - GenericProjector: pre-request JxW to fix issue with certain FEs.
    - reduced_basis: Fix output data format in legacy SCM writes.
    - Homepage: mention Github issues and pull requests
    - Utility::hashword is now compatible with both std::array and std::vector.

1.2.1 -> 1.3.0
  * Weaken copy_node_and_elements partition assertion.
  * Switch to "diagnostic push/pop" calls for GCC to ignore warnings.
  * Fix performance issue and bugs in CouplingMatrix row iterators.
  * Add --with-thread-model=openmp option, default to pthreads instead of TBB.
  * Cache dof indices when computing sparsity (optimization).
  * Temporarily skip running fem_system_ex2 due to changes in 3b4b2fb.
  * Install the gzstream.h header along with the rest of libmesh.
  * Update to latest nanoflann (pre-1.3.0).
  * PetscNonlinearSolver:
    - Allow user to provid separate fd and mffd evaluation functions.
    - Use MatSNESMFSetReuseBase() API.
  * Remove libmesh_experimental() from dg_fem_context.C.
  * Make nested Parameters::Value public to allow use of the begin()/end() API.
  * Remove update() call from FEMSystem::assembly(), call beforehand as necessary.
  * Update LICENSE.txt file distributed with Metis.
  * Add new shape quality metrics for QUAD4 elements.
  * Remove many libmesh_error_msg("We'll never get here.") sections.
  * Deprecate raw memory returning Preconditioner::build().
  * Drop support for older compilers from DETERMINE_CXX_BRAND.
  * JumpErrorEstimator fix for non-zero-norm SCALAR.
  * Make LinearPartitioner DistributedMesh-compatible.
  * Add System::projection_matrix() which uses MetaPhysicL.
  * Add MetaPhysicL 0.2.0 to contrib.
  * Avoid repeated function calls in old_dof_indices().
  * Add support for detecting Intel 18.
  * Break EquationSystems::reinit() into solutions and systems parts.
  * Fix check in PetscVector<Complex>::localize_to_one().
  * TypeNTensor:
    - Add add_scaled() method.
    - Add _coords data member.
  * Add FEInterface::n_dofs_at_node_function().
  * Add the as_range() utility for working with std:: multi containers.
  * Fix unit test of writing vector and scalar variables in parallel.
  * Infinite Elements:
    - Enable second order infinite elements.
    - Optimize contains_point() by avoiding inverse_map() calls.
    - Change type of "current frequency" to Number.
    - Add support for System::point_value().
    - DistributedMesh fixes.
    - Add miscellaneous_ex14 demonstrating infinite element use with complex frequencies.
  * Use node_ref_range(), neighbor_ptr_range(), side_index_range(), etc. in loops.
  * EigenSolver: don't always close() matrix before solve.
  * Add --disable-deprecated configure option.
  * Add support for SHELL8 elements, which are basically treated as QUAD8s.
  * Avoid n_children() calls in for-loop bodies, use range-based loops.
  * Add potential early return from refine_and_coarsen_elements().
  * Add SparseMatrix::flux() API.
  * Fix bug with XDR output of 64-bit int, long.
  * Move libmesh library PATH to beginning of 'libmesh-config --libs'.
  * Fix many documentation typos, spelling errors, etc.
  * Add backward-compatible support for [[fallthrough]] attribute.
  * Add Parallel::allgather(vector<string>) overload.
  * TetGenIO: Update code for reading .ele files.
  * Use the base class version of greedy_termination_test in RBEIMConstruction.
  * Pass sanitizer flags when both compiling and linking.
  * DofMap:
    - Add dof_owner() search.
    - Add semilocal_index().
    - Add check for cyclic constraints.
  * Disable dlopen(), getpwuid() when doing all-static linking.
  * Mesh:
    - Add is_serial_on_zero().
    - Add set_distributed().
    - Optimizations/bug fixes in stitch_meshes().
    - Add various element_ptr_range(), node_ptr_range() to facilitate range-based for-loops.
    - Fix constructor bug where _count_lower_dim_elems_in_point_locator was uninitialized.
  * Add constructor to FEMContext for specifying extra_quadrature_order.
  * Build system changes for compiling on Windows with MSys2.
  * Write version to reduced basis Xdr headers.
  * Avoid redundant init of old, older System vectors.
  * Make SparseMatrix::close() non-const, avoid calling it on const objects.
  * Set LIBMESH_HAVE_EXTERNAL_BOOST if an external boost is found.
  * PerfLog:
    - Add getter for underlying PerfLog data structure.
    - Use const char * instead of std::string for speed.
    - Add PerfData::pause_for().
  * Fixes for coarsening of adaptively-refined DistributedMeshes.
  * Add DenseVector(N, value) constructor.
  * Improvements to src/apps/meshdiff.C
  * Doxygen:
    - Use \deprecated and \returns flags in documentation.
    - Add client-side search boxes on Doxygen pages.
  * Disallow renumbering when plotting ErrorVector.
  * Fixes to AdjointRefinementErrorEstimator in FEMSystem with lift function.
  * Add adjoints_ex6.
  * Fixes in UnstructuredMesh::find_neighbors().
  * Use new APIs in fem_system_ex1.
  * Fparser
    - Add support for "erf" in parsed function strings.
    - Avoid race condition on asynchronous networked filesystems.
    - Close file descriptors returned by mkstemp.
    - Add registered derivatives to hash.
  * Miscellaneous fixes for non-standard configurations.
    - --disable-exodus
    - --disable-amr
    - --disable-fparser
    - --disable-mpi
    - --disable-optional
    - --disable-exceptions
  * C++11:
    - LibMesh now requires a C++11-conforming compiler.
    - The last C++03 commit is 613c152f0, tag:cpp03_final.
    - Add configure test for std::erf().
    - Add test for noexcept keyword.
    - LIBMESH_BEST_UNORDERED_XYZ macros now required to be std::unordered_map,set etc.
    - No space between nested closing template angle brackets.
    - Replace UniquePtr with std::unique_ptr everywhere.
    - Use libmesh_make_unique instead of 'new' where possible.
    - Use containers of std::unique_ptrs where possible.
  * Add StreamRedirector class to handle stream resetting with RAII, use in WhichNodeAmITest.
  * Make build_cube() use ordered element ids for DistributedMesh.
  * Fix BoundaryMesh unit test in parallel.
  * Fix ReferenceCountedObject::operator=().
  * Add ifdef'd move constructor to ReferenceCounter.
  * Remove old, unused scripts from contrib/bin.
  * Respect subdomains_relative_to set in BoundaryInfo::sync().
  * Store string passed to libmesh_error_msg inside exception object.
  * Disallow remote element removal during Mesh copy.
  * Remove -Wunused-parameter from our CFLAGS list.
  * Add optional Exodus file output to adjoints_ex*
  * PetscDiffSolver: enforce constraints on current_local_solution to avoid PETSc locking issue.
  * BoundingBox
    - Add union_with(Point).
    - MeshTools::create_nodal_bounding_box().
    - Add MeshTools::create_local_bounding_box().
    - Use nodal bounding box for Hilbert transformations.
  * ExodusII_IO:
    - Fix single-precision bug in write_timestep().
    - Batch writing of subdomain, block, and sideset data to file.
    - Fix copy_elemental_solution() in parallel.
    - Add write_timestep_discontinuous().
    - Turn off verbose output by default in debug mode.
    - Add read_elemental_variable(), read_global_variable() interfaces.
    - Add optional system_names arguments to write_timestep() methods.
  * CheckpointIO:
    - DistributedMesh fixes and additonal unit testing.
    - Fix remote_elem child link handling.
    - More robust extra_ghost_elem handling.
    - The splitter unit tests require XDR.
    - Put sideset/nodeset names in header.
    - Fix read_remote_elem() in N->M case.
    - Store integer data type in CheckpointIO files.
    - Support changing the number of ghosted layers in Splitter.
    - Changes to CheckpointIO filenaming scheme.
    - Refactor mesh splitter app into a function.
  * AbaqusIO: support more element types, optionally skip sideset generation.
  * Elem:
    - Add more total_family_tree_* methods.
    - Add remove_links_to_me().
    - Add which_node_am_i().
    - Add raw_child_ptr() accessor.
  * Fix assert in reduced_basis_ex4.

1.2.0 -> 1.2.1
  * Bugfix/compatibility release.
  * Update bundled NetCDF from 4.3.1 -> 4.4.1.1.
  * Fix for upcoming MatGetSubMatrix name change.
  * 64-bit indices fix in src/apps/amr.C.
  * Add empty LIBMESH_PARALLEL_FLOAT_OPS macro for --disable-mpi case.

1.1.0 -> 1.2.0
  * 1.2.0 is the last release that does not require a C++11 compiler.
  * Add Eigen optimizations for DenseVector::l2_norm(), l1_norm(), linfty_norm(), dot().
  * Add clang-specific vectorization pragmas in DenseVector.
  * Fix BoundaryInfo::operator=
  * Add EquationSystems flag to skip internal refine/coarsen calls.
  * Add MeshBase::is_replicated() function.
  * AbaqusIO: Support reading elements of type 'S3'.
  * AbaqusIO: Support generated elsets and nsets.
  * ImplicitSystem: Allow users to control if the matrix and RHS should be zeroed out.
  * Fix issue where delete_remote_elements() was called inappropriately.
  * Remove PetscMatrix::update_preallocation_and_zero().
  * Deprecate old Elem and Mesh interfaces and constructors.
  * Officially remove long-deprecated MeshData class.
  * Fix unsigned int/size_t mismatch in for loops.
  * Move BoundingBox to its own header, deprecate old usage.
  * Add Elem::loose_bounding_box() implementations.
  * GmshIO: Allow multiple lower-dimensional elements for BCs.
  * Add BoundaryInfo::regenerate_id_sets().
  * Use *parallel* max_elem_id in assert code.
  * Fix DistributedMesh build_node_list_from_side_list().
  * Support for VTK-7.1.
  * Misc. VTK improvements from @acbauer (avoid memory leaks, etc.).
  * Fix issues with mesh extrusion when using DistributedMesh.
  * Add MappedSubdomainPartitioner, maps subdomains to processor ids.
  * Add Distributed-compatible BoundaryInfo unit tests.
  * FEMSystem: Add solvers for second-order in time problems.
  * Add missing Pyramid sidesets in ExodusII_IO.
  * Add SubdomainPartitioner, partitions "chunks" of subdomains.
  * Fix issues with vectormap::find().
  * Add evaluable_nodes iterators.
  * CheckPointIO format can now be used to pre-split meshes.
  * Fix several issues in CheckPointIO.
  * Misc. Doxygen updates, fix issue with missing libmesh_final classes.
  * int -> PetscBLASInt in BLAS/LAPACK routines.
  * AdjointRefinement ghosted adjoint compatibility.
  * Fixes for multisystem XDA reads.
  * Fix gmsh numbering and node ordering for PRISM15.
  * PointLocator fixes and updates for "truss-like" meshes.
  * Add extra package search paths in trilinos.m4.
  * inverse_map() fixes for infinite elements.
  * Update AutoPtr unit test to test UniquePtr.
  * Adjust tolerance in Edge3::volume().
  * Update fix for errno.h inclusion in a namespace.
  * Reorder paths starting with /lib to the end of the linking list.
  * Fix misc. documentation typos and wording in geom, quadrature, partitioning.
  * Use the -fno-limit-debug-info flag in dbg/devel mode for clang.
  * Use the '-Wunused -Wunused-parameter' flags for clang in all modes.
  * Avoid printing unprintable [unsigned] char Parameters.
  * Only serialize the Mesh to processor 0 for Exodus.
  * Add a barrier() to ~LibMeshInit to avoid missing potential error messages.
  * Misc. DistributedMesh fixes.
  * Fixes for MeshTools::n*levels().
  * Various source code formatting improvements.
  * Optionally skip find_neighbors in MeshBase::read().
  * SLEPc: Add option to set initial guess.
  * SLEPc: Add 'target' spectrum positions.
  * SLEPc: detect major, minor, subminor version numbers during configure.
  * Add SLEPC_VERSION_LESS_THAN macro.
  * Fix binary writing of GMV files.
  * Fix bug when merging NULL+non-null CouplingMatrix.
  * Mange the lifetimes of various protected members with UniquePtrs.
  * Add PointNeighborCoupling class and unit test.
  * Fix bugs in MeshTools::all_tri().
  * Deprecate ImplicitSystem::get_linear_solver().
  * Use os_unfair_lock() for Mac OS X Sierra compatibility.
  * Allow virtual methods for edge_fe_reinit() and elem_fe_reinit().
  * Enable 1D Hermite elements of arbitrary p.
  * Prefix libMesh Parallel:: macros with LIBMESH_.
  * Fix GetPot off-by-1 bug.
  * Add support for --redirect-output command line option.
  * Move serial->replicated_mesh.h, parallel->distributed_mesh.h headers.
  * Add GetPot::get_subsection_names() and unit tests.
  * Various Trilinos ifdef fixes.
  * Add PointLocatorBase::locate_node() and unit tests.
  * Various Doxygen fixes, update docs at libmesh.github.io.
  * Bugfix for FEMContext::pre_fe_reinit SCALAR case
  * Add historic authorship information for various classes.
  * Add libmesh_isinf() helper function.
  * Optionally skip lower dimensional element counting in TreeNode.
  * More robust caching with Clough-Tocher elements.
  * Add MeshTools::paranoid_n_levels().
  * Add MeshCommunication::send_coarse_ghosts().
  * Fixes for MeshTools::n*levels on empty meshes.
  * Ignore TBB placement-new warnings in GCC6.
  * Fix bug in Tri3::contains_point() implementation affecting small triangles.
  * Fix issue with missing incrementing copy constructor to ReferenceCounter class.
  * Add compiler.m4 support for Intel 2017 compilers.
  * Fix for ExodusII_IO::write_timestep() in single precision case.
  * Fix issue with accessing read-only solution vector in PetscDiffSolver.
  * Include CITATION file with distributed tarballs.
  * Disallow remote element removal during Mesh copy.
  * Fix ExodusII_IO::copy_* on distributed meshes.

1.0.0 -> 1.1.0
  * Add interface for passing the transpose nullspace to PETSc.
  * Fixes for MPI implementations not quite compatible with MPI-2.
  * Generalize/modernize systems_of_equations_ex2,3.
  * Fix/document issues with DirichletBoundary variable ordering.
  * Add new GhostingFunctor interfaces for generalizing which dofs are ghosted.
  * Correctly use MPI_UNSIGNED_LONG_LONG to wrap unsigned long long types.
  * Add TransientSystem<EigenSystem> typedef.
  * Add gather(), allgather() overloads for std::string.
  * Fix pack_range bug.
  * Misc. NemesisIO fixes including writing node/sideset ids and names.
  * Abaqus reader now tolerates whitespace before commas in *NODE sections.
  * Add BoundaryVolumeSolutionTransfer class.
  * Fix FParser AD data file race in parallel.
  * Add --drop-cerr command line argument.
  * Fix warnings by avoiding the possibility of throwing from destructors.
  * Fix multi-dimensional mesh partitioning bug in Metis.
  * Add vector<vector> scatter implementation.
  * Update bundled Eigen from 3.2.5 to 3.2.9.
  * Fix detection of VTK 6.0 (we skipped straight to 6.1 for some reason)
  * Add QUADSHELL4/TRISHELL3 support to Exodus reader, FE, and Mesh classes.
  * Update bundled boost subset from 1.55 to 1.61.
  * Minimum boost version required for building libmesh bumped to 1.57.
  * Remove deprecated Mesh IO classes (DivaIO, LegacyXdrIO, MGF).
  * Fix deprecated header warnings caused by CPPUnit.
  * Misc. infinite elements fixes from Hubert Weissmann.
  * Enhance MeshFunction/PointLocator to work with discontinuous FEM on faces.
  * Enhance System::point_value() interface to make it harder to call incorrectly.
  * Implement DenseMatrix::svd() for --enable-complex builds.
  * Avoid double call to KSPSetFromOptions.
  * Throw exception from TypeTensor::solve() on zero determinant.
  * Handle exceptions thrown by TypeTensor::solve() in FE::inverse_map().
  * Remove previously-deprecated PointLocatorList class.
  * Fix Hypre detection for PETSc 3.6.x+ builds.
  * Use n_active_elem() instead of n_elem() when flagging by elem fraction.
  * Guard Trilinos header includes with ignore/restore warnings headers.
  * Fix issue where the PointLocator _initialized flag was not reset by clear().
  * Add get_array() capability to PetscVector and use internally.
  * Enhance DenseMatrix::evd() interface to also compute left and right eigenvalues.
  * Add MPI_Scatter wrappers to Parallel:: interface.
  * Add --enable-petsc-required configure option.
  * Add extensive unit tests of various FE/Elem combinations.
  * Fix caching bugs in FEXYZ and CLOUGH element types.
  * Fix bugs and add unit tests of reading unique ids.
  * Use PetscViewerPushFormat in PetscMatrix and PetscVector.
  * Miscellaneous --enable-single (single precision) bug fixes.
  * Keep boundary IDs consistent on DistributedMesh.
  * Avoid writing trailing whitespace to XDA files.
  * Add --enable-cxx11-required configure option.
  * Add all_first_order option to meshtool.
  * Optimize stitch_meshes() algorithm by avoiding unnecessary PointLocator calls.
  * Add configure test for std::make_unique() and libmesh_make_unique() workaround.
  * Add MeshBase::active_semilocal_elements_begin()/end() accessors.
  * Handle NULL elements in EquationSystems::get_solution().
  * Fix const-correctness issues in Elem interface, deprecate old interfaces.
  * Add configure test of C++11 noexcept.
  * Remove object-oriented C from misc_ex7.
  * Restrict several examples to only run with specific linear solver packages.
  * Slight optimizations to Tri6, Hex8::volume().
  * Add optimized specialization of Elem::contains_point() for Tet4.
  * Add TypeTensor::solve() and replace inverse/multiply in a few places.
  * Add unit test for FParser automatic differentiation optimization.
  * Don't use WRITE_PARALLEL_FILES for Xdr files unless requested.
  * Update systems_of_equations_ex8 to use EDGE2 elements for connecting contact nodes.
  * Add unit tests for EulerSolver, Euler2Solver, and NewmarkSolver.
  * Don't assume interior_parents() are always part of the same Mesh.
  * Add vectormap::find() const and non-const versions.
  * Avoid repeatedly destroying/creating vector in compute_affine_map().
  * Add reinit_func() to NewmarkSolver, setters for beta, gamma.
  * Better documentation for FEMContext::<elem,side,edge>_reinit.
  * Call connect_children() in MeshCommunication.
  * Use write_discontinuous_exodusII() to plot stress in systems_of_equations_ex6.
  * FEInterface::map() now handles infinite elements.
  * Replace a few remaining deprecated uses of TypeVector::size() with norm().
  * Only call ex_update() on Exodus files that are open for writing.
  * Fix logic bug in ParameterVector::clear().
  * Add DofMap::gather_constraints() helper function, use in allgather_constraints().
  * Fix for writing NodeElems in ExodusII_IO_Helper::write_elements().
  * Add ability to set user-defined flags when calling TetgenMeshInterface functions.
  * Move ReplicatedMesh->replicated_mesh.h, DistributedMesh->distributed_mesh.h

0.9.5 -> 1.0.0
  * Add parallel I/O for Nemesis format, solution vector is no longer broadcast.
  * Elem: add node_ref(), node_ptr(), node_id().
  * Mesh: add node_ref(), elem_ref(), elem_ptr().
  * Deprecate DivaIO, Xdr{MESH,MGF,SOLN,MHEAD,SHEAD,HEAD}, LegacyXdrIO classes.
  * Improve HDF5 configure tests, link against -lhdf5_cpp when available.
  * Use PETSc's METIS, if available and PETSc is enabled.
  * Add RAII-based performance logging macro, LOG_SCOPE.
  * VTKIO is a "parallel" I/O format, it is now marked as such.
  * Optimize FEMap calculations, standardize get_foo() usage.
  * Configure with --enable-unique-ptr by default.
  * CondensedEigenSystem: condense out constrained dofs to avoid spurious eigenvalues.
  * Add OrderWrapper shim class, we are no longer limited by Order enum.
  * Free communicators created by a split().
  * Add --with-thread-model configure flag, split threads.h into separate files.
  * Make adaptivity_ex3 use HIERARCHIC elements by default, test p and hp refinement.
  * hp-adaptivity/coarsening fixes for ParallelMesh.
  * Fixes for infinite elements in misc_ex1, ExodusII_IO.
  * Add C++03/11 appropriate locking to PetscVector::_get_array().
  * FEMContext: Don't increment hardest_fe_type order for SCALARs.
  * Add SPARSELU SolverType for Eigen.
  * Add misc_ex12 demonstrating the MITC4 element.
  * Bugfix for DofMap::constrain_element_matrix().
  * Add Type{Vector,Tensor}::norm(), norm_sq() replacing size(), size_sq().
  * Allow KSP tolerances to be set from the command line.
  * Remove PETSc < 2.3.3 code paths.
  * Add triple_product(a,b,c) for TypeVectors.
  * Fix EIM truth_solve on hybrid meshes.
  * Optimize EIM by storing inner_product * basis functions
  * Add method to plot EIM parameterized functions.
  * Add notion of time-dependence to FunctionBase.
  * Replace NULL usage with backwards-compatible libmesh_nullptr.
  * Optimized memory usage in EIM construction.
  * Add optimized Elem::volume() implementations for all Elem types.
  * Refactor EnsightIO object to use C++ I/O and string handling.
  * Mulitple re-optimizations of new GenericProjector codepath.
  * Mark various leaf classes as "libmesh_final".
  * Redesign Parallel packed_range functions.
  * Add GMRES support to EigenSparseLinearSolver.
  * MeshBase::spatial_dimension() is no longer simply LIBMESH_DIM.
  * Add unit test of refining a slit mesh.
  * NewmarkSolver: fix cache w/o restore bug.
  * Fix dimension==0 issue in MeshTools::Generation::build_sphere() after clearing mesh.
  * Add EigenSparseMatrix::l1_norm(), linfty_norm().
  * Fix memory leak in vector_fe_ex{2,3,4}.
  * Generalize build_cube() Gauss-Lobatto grid using redistribute().
  * PointLocatorList class deprecated.
  * Set preprocessor tokens when PETSc has SuperLU_dist and/or MUMPS support.
  * Make System::calculate_norm() work on mixed-dimension meshes.
  * Add support for writing NodeElems in Exodus using "SPHERE" elements.
  * MeshTools::Modification::all_tri() generalized to work with Prisms, Hexes.
  * Use unique_ids to disambiguate Hilbert orderings with overlapping nodes.
  * Fixes for unique_ids with ParallelMesh.
  * Unify spacing around pointer/reference declarations, establish coding convention.
  * Many configure tests added for C++11 features.  Test regardless of --enable/--disable-cxx11.
  * Fix for writing Exodus files with non-contiguous node numberings.
  * Add BounaryInfo::remove_id().
  * Fix misc. Doxygen warnings, simplify examples documentation generation.
  * Misc. updates/fixes to FParser AD and JIT capabilities.
  * Check for consistency between libMesh and PETSc scalar and index types.
  * Add DenseMatrix::svd_solve().
  * Fix DenseMatrix::svd(sigma, U, VT) in rectangular case.
  * Refactor Elem::side() functions to use existing "sides_node_map" arrays.
  * Add Elem::key() interface, consistent with Elem::key(side) on lower-dimensional elements.
  * PETSc/TAO interface updates for PETSc 3.7.0.
  * Detect and workaround TRI3 numbering inconsistency in Cubit 14 and 15.
  * Update bundled automake from 1.12.5 -> 1.15.
  * Update bundled libtool from 2.4.2 -> 2.4.6.
  * Make header/forward declaration fixes suggested by cppclean.
  * Deprecate BoundaryInfo::add_{side,node,edge}() which returned result by value.
  * Replace deprecated BoundaryInfo functions with versions taking a vector by reference.
  * Refactor/update the UCDIO class.

0.9.4 -> 0.9.5
  * Add interface to SLEPc's solver for generalized indefinite Hermitian eigenvalue problems (GHIEP).
  * Refactor NumericVector::insert(), add PetscVector<T>::insert() specializations.
  * Refactor NumericVector::add_vector().
  * Add DiffContext::elem_solution_rate.
  * Add systems_of_equations_ex7, solves large deformation elasticity.
  * Add hand-coded TypeTensor<T>::inverse().
  * Add static Elem::invalid_subdomain_id value.
  * Bugfix in PatchRecoveryErrorEstimator.
  * Miscellaneous improvements to FParser/FPOptimizer/JIT/AD code.
  * Add/enhance unit tests for many classes.
  * Add Elem::build(NODEELEM).
  * Add CompositeFunction and CompositeFEMFunction.
  * Add NameBasedIO, refactor UnstructuredMesh::read().
  * Add 2D Grundmann-Moller quadrature rules for triangles.
  * Improve OpenMP configure test.
  * Return "invalid" ids from MeshBase::get_id_by_name(), BoundaryInfo::get_id_by_name() rather than erroring.
  * Generalize the concept of "dimension" in Mesh with elem_dimensions std::set.
  * Add the ParameterAccessor, ParameterMultiPointer class hierarchies.
  * Fix bug in adjoints_ex3.
  * Allow custom gdb command, enabling/disabling of gdb backtraces.
  * Add mixed dimension mesh support to PointLocator.
  * Add post-init() EquationSystems::add_system().
  * Fix PointLocator bug in 2D case where elements aren't in x-y plane.
  * Update AutoPtr to UniquePtr, add build support for Howard Hinnant's C++03 unique_ptr implementation.
  * Miscellaneous bugfixes to support configuring with --with-dof-id-bytes=8.
  * Add TopologyMap class, use to look up new nodes during refinement.
  * Merge METIS/ParMETIS upstream patches from PETSc repo.
  * Make METIS IDXTYPEWIDTH and REALTYPEWIDTH match dof_id_type and Real, respectively.
  * Add MeshBase::{bnd,bid}_nodes_{begin,end}.
  * Add systems_of_equations_ex8, solves linear elasticity with contact.
  * Add GenericProjector, use to refactor FEM projection code.
  * Add support for linking against VTK 6.2+.
  * Add ErrorEstimatorType enum.
  * Correctly compute second derivatives on non-affine elements.
  * Tetgen is no longer enabled unless libmesh is configured with --disable-strict-lgpl.
  * Miscellaneous bugfixes in RBEIMConstruction.
  * Adding Optimization{Solver,System} classes, examples with nlopt and TAO instantiations.
  * Add configure test for dlopen() and friends.
  * Add embedding matrix for Prism15.
  * Add EigenSparseLinearSolver::get_converged_reason().
  * Add support for 1D elements in MeshTools::find_nodal_neighbors().
  * Replace uses of "echo -n" in shell scripts with printf.
  * Add support for PETSc 3.6.x release series.
  * Use common FEMParameters in adjoints examples.
  * Add support (and bugfixes) for mixed dimension refinement.
  * Add NewmarkSolver support for FEMSystem-based codes.
  * Add support for sparse CouplingMatrix.  Improves performance in many-sparsely-coupled-variables problems.
  * Add {First,Second}OrderUnsteadySolver for FEMSystem-based codes.
  * Support reading boundary conditions and lower-dimensional elements in Gmsh files.
  * Refactoring/bugfixes in misc_ex3, use object-oriented NonlinearImplicitSystem interface.
  * Upgrade Eigen distributed with libmesh to version 3.2.5.
  * Add Cap'n Proto serialization support in reduced basis code and examples.
  * Multiple bugfixes for the --enable-complex configuration.
  * Miscellaneous bugfixes for single precision and long double precision builds.
  * Detect version 3.6.0+ in SLEPc configure test.
  * Add support for debug-enabled PETSc builds -- Vec{Get,Restore}ArrayRead(), fix redundant close() calls, etc.
  * Parallel mesh repartitioning bugfixes/enhancements.
  * Miscellaneous improvements to trilinos.m4, set more #defines for the parts of Trilinos which are available.
  * Bugfixes for non-blocking send/receive requiring persistent buffers.
  * Add support for user-defined subdomain id assignment in MeshExtrusion.
  * Add MeshBase::ghost_elements_{begin,end} iterators.
  * Add SolverConfiguration class to generalize the setting of complicated solver parameters.
  * Add PetscSolverException, change LIBMESH_CHKERRABORT -> LIBMESH_CHKERR to throw exceptions rather than aborting.
  * Miscellaneous improvements/bugfixes to Parsed*Function classes.
  * Miscellaneous bugfixes in Trilinos support code, better include guards.
  * Use C++11 "override" feature via libmesh_override where appropriate.
  * Remove outdated QuadratureRules and ElementTypes functionality.
  * Support "if (!foo)" for AutoPtr using safe_bool<T> utility function.

0.9.3 -> 0.9.4
  * Pyramid13 elements
  * Subdivision surfaces
  * Support for PETSc fieldsplits
  * Point loads in reduced basis problems
  * Improved AdjointRefinementErrorEstimator indicator quality
  * Discontinous plotting can be done with subsets of EquationSystems
  * complex-valued and single-precision ExodusII/Nemesis output
  * allow appending to Tecplot ASCII files
  * improved Abaqus, Gmsh, UNV I/O support
  * VTK 6 support
  * QHull now distributed in contrib/
  * Several Fparser enhancements by @dschwen
    * Automatic differentiation
    * Allow NaN in fparser parsed functions
    * Fparser JIT support
    * Many fpoptimizer bugfixes
    * plog (polynomial log approximation) function added
  * Support NaN to locally disable DirichletBoundary functions
  * Methods for nonlocal computations with SCALARs in FEMSystem
  * PointLocator option for local element searches
  * PointLocator/MeshFunction option for searches close to elements
  * Better solver convergence reporting
  * Better 16-bit and 64-bit hash functions
  * Better QGrid behavior, documentation
  * DenseMatrix eigenvalue computations
  * DenseMatrix operations with mixed scalar types
  * Mesh stitching can now be done using node and edge boundary IDs
  * Variational mesh smoother refactoring
  * MeshModification::transform() with arbitrary warping functions
  * Use MPI_THREAD_FUNNELED when available
  * libmesh_cast_ptr/ref/int deprecated, replaced by cast_ptr/ref/int
  * libMeshEnums namespace removed; enumerations in libMesh namespace
  * Configure tests for more C++11 features
  * Default complation with -std=c++11, easier for users to disable
  * Better configure autodetection of slepc, eigen compatibility
  * configure options for software licensing
    * non-LGPL-compatible options disabled by default
    * libHilbert now under LGPL
  * clearer "configure --help" output
  * more verbose error messages using libmesh_error_msg()
  * reformatted source code, no tabs should be in code from now on
  * Assorted bug fixes, optimizations, new regression tests
    * all_first_order() and build_extrusion() bugs fixed
    * fixed libHilbert interface regression
      * some xda/xdr files created with 0.9.3 MAY BE CORRUPTED when
        read with older/newer libMesh versions, and vice-versa!
    * fixed bug with stitching "slivers"
    * fixed std::memset bug which pops up for newer GCCs on OSX
    * fixed misc. distcheck bugs
  * Many fixes to silence paranoid compiler warnings (see doc/notes/compiler_warnings.txt)
  * Use -f when symbolic linking files during build/install stage
  * 1D Gauss-Lobatto quadrature rules, additional quadrature unit testing
  * Cut-cell quadrature (ElemCutter, QComposite classes) for XFEM
  * Per-subdomain scalar variable support
  * Added 'meshavg' application for averaging solutions
  * GDB backtraces and backtraces from the segfault handler
  * Support -fsanitize=address flags on newer Clang and GCC compilers
  * http://libmesh.github.io created, http://libmesh.sf.net is gone/permanently blocked
  * "make doc" target completely overhauled
  * Protect Mesh::BoundaryInfo behind an accessor.
  * NumericVector::add_vector(), ::get(), ::insert() refactoring.

0.9.2 -> 0.9.3
  * FEMContext public members now private, must use API pushed in 0.9.2.
    Breaks backward compatibility of FEMContext.
  * Intel 14.0 Compatibility.
  * Streamlined checkpoint/restart capability for ephemeral usage.
  * new --disable-warnings option.
  * Added heterogeneous Dirichlet adjoint constraints.
  * Added edge Dirichlet constraints.
  * Improved support for non-32-bit IDs.
  * PETSc 3.5 support.
  * OSX 10.9 XDR compatibility.
  * Memory optimizations for Metis/Parmetis partitioning auxiliary
    data structures.
  * HEX20, PRISM15, PYRAMID5, PYRAMID14 shape functions.
  * Nedelec elements.
  * Upgraded bundled Boost to v1.55.
  * Expanded ExodusII API.
  * Additional enum/string conversion utility functions.
  * Assorted bugfixes:
    * for SzaBab and Bernstein h-adaptivity.
    * for p-adaptivity.
  * global_n_processors()/global_processor_id() functions to access
    MPI rank information from the original communicator used to
    initialize the library
  * Fixed longstanding bug that could arise for mixed finite element
    types with ParallelMesh on specific partitionings

0.9.1 -> 0.9.2
  * PETSc 3.4 support
  * PETSc BAIJ matrix support for blocked matrices
    * opt-in for this with './configure --enable-blocked-storage ...'
    * may cause issues with preallocation in Reduced Basis code -
      see http://sourceforge.net/mailarchive/forum.php?thread_name=B4613A7D-0033-43C7-A9DF-5A801217A097%40nasa.gov&forum_name=libmesh-devel
  * Refreshed packaged METIS and ParMETIS to latest versions
  * Experimental support for DGFEMContext
  * New accessor API for FEMContext objects. Public members deprecated.
  * Assorted bugfixes:
    * for nonstandard index sizes

0.9.0 -> 0.9.1
  * Multi-communicator-capable objects
    * Communicator-using ParallelObject subclasses can be initialized
      with arbitrary MPI communicators, independent of the
      communicator used to init libMesh or the communicators used by
      other non-interacting objects
    * No internal library code still uses CommWorld communicators
    * CommWorld and global Parallel:: methods can be disabled via
      configure --disable-default-comm-world, breaking backwards
      compatibility, to facilitate compile-time checking of
      libMesh-based codes for compatibility with multi-communicator
      usage.
      * These methods will be disabled by default in future versions,
	but configure --enable-default-comm-world will work for the
        next few releases
  * Additional specializations for Parallel:: communication methods
  * New SolutionTransfer infrastructure, implementations, examples
  * Singleton framework added
  * Complex-valued libMesh builds can new read real-valued restarts
  * Interface to and contrib copy of Eigen linear algebra package
  * Interface to and contrib copy of newer Nemesis/ExodusII/NetCDF
  * build Tecplot binary I/O library from source,
    * old behavior can be restored via --disable-tecio --enable-tecplot
  * Assorted bugfixes:
    * UnsteadySolver is now more robust inside AMR loops
    * Preconditioner setup is more robust with AMR
    * Fixes in Trilinos and SLEPc package interfaces
    * Fix for multithreaded QoI derivative assembly
    * Fixes for compiler and 3rd party library compatibility
  * Clarifications, updates to API documentation


0.8.0 -> 0.9.0
  * automake build system
    libMesh-specific implementation features:
    source and header files must be listed explicitly.
    When adding a header file,
      1.) svn add the file
      2.) cd include ; ./rebuild_include_HEADERS.sh
      3.) cd include/libmesh ; ./rebuild_makefile.sh
    When adding a soure file,
      1.) svn add the file
      2.) cd src ; ./rebuild_libmesh_la_SOURCES.sh
    General notes:
      o make install && make installcheck
        installs the built library & performs sanity checking
      o make distcheck
        packages up a tarball and tests it for self-sufficiency.
	always do this when modifying the build system.
      o for more information, view the README and INSTALL files.
  * VariableGroups DofObject storage optimization for the common
    case of multiple Variables of the same type within a System.
    Note this changes the default variable ordering within a
    System - the old format is available via System::identify_variable_groups()
  * TecplotIO binary format updated to support v11.2 features where
    available.  This includes encoding the solution time into output files,
    writing each libMesh subdomain to a separate Tecplot zone, and support
    for 1D Tecplot binary files.
  * ./configure'able support for identifier types. Defaults:
         id size (boundaries)............. : 2 bytes
         id size (dofs)................... : 4 bytes
         id size (processors)............. : 2 bytes
         id size (subdomains)............. : 2 bytes
  * Reduced memory footprint for Node objects.
  * Fix for using specified preconditioners with adaptivity and PETSc-3.3.
  * New Examples:
     o fem_system_ex2: Nonlinear elasticity, courtesy Robert Weidlich.
     o adjoints_ex5: Unsteady Adjoints.
     o miscellaneous_ex8: meshfree, inverse distance interpolation.


0.7.3 -> 0.8.0
  * Vector-valued finite elements & related examples
  * Entirely refactored Parallel namespace implementation
  * Properly communicate DofIndices when communicating DofObjects
  * std::thread-like asynchronous function execution
  * Refactored serialized EquationSystems I/O for increased performance
  * Heterogeneous constraints & bug fixes
  * Proper DirichletConstraints Dirichlet boundary conditions
  * Improved PeriodicBoundary support
  * Refactored, parallelized SparsityPattern generation
  * Weighted Patch Recovery Error Estimator suppport
  * Relocated header files, e.g.
      #include "dof_map.h" becomes
      #include "libmesh/dof_map.h"
    this will be strictly enforced in the next release.
  * ParallelMesh fixes
  * PGI, Sun Studio compiler portability fixes
  * MeshTools::Generation::build_sphere() icosahedron support
  * Improved Abaqus reader support
  * Improved UCDIO writer support
  * Output only a subset of variables from EquationSystems
  * Run-time floating point exception trapping via --enable-fpe
  * Refreshed packaged METIS and ParMETIS to latest versions
  * PETSc-3.3, SLEPc 3.3 support
  * Trilinos-11 support
  * Mac OSX 10.8 "Mountain Lion" fixes
  * New Examples:
     o systems_of_equations 4, 5, 6: 2D and 3D linear elasticity
     o reduced_basis_ex5: 3D linear elasticity with the Reduced Basis method
     o reduced_basis_ex6: Empirical interpolation method for a geometrically parametrized domain in 3D
     o reduced_basis_ex7: Complex-valued Reduced Basis problem modeling an acoustic horn


0.7.2 -> 0.7.3
  * Templated FunctionBase and subclass functors
  * Functor-based versions of more system APIs
  * Integrated function parser based functor
  * More flexible PetscMatrix responds to -mat_type
  * Elem::close_to_point() method for contact problems
  * Heterogenous constraint equation support
  * Dirichlet constraint equation support
  * More methods are ParallelMesh-compatible
  * Mesh extrusion generation
  * UniformRefinement error estimates for more adjoint options
  * Element truth table written in ExodusII output
  * GetPot detection of overridden variables
  * Reorganized examples by category
  * C++11 compatibility fixes
  * Many assorted bug fixes

0.7.1 -> 0.7.2
  * Discontinuous hierarchic FE basis
  * PatchRecoveryErrorEstimator patch reuse option
  * New partitioning-aware Patch construction option
  * More efficient adjoint solves with PETSc
  * New projection example utility
  * Bare System objects are now useful for efficient utilities
  * Many Exodus/Nemesis output improvements
  * BoundaryInfo::sync() is now AMR- and ParallelMesh-compatible
  * More code is now ParallelMesh-compatible
  * More flexible Parallel:: APIs
  * Elem:: utilities for semi-structured grids
  * NodeConstraints calculations for moving mesh users
  * Stack trace output on any uncaught exception
  * Corrected non-standard C++ in FE class specializations
  * Multithreaded FEMSystem assembly functions
  * Assorted efficiency improvements
  * Various Trilinos, Tetgen, Triangle interface improvements
  * Compatibility with newer third-party packages, compilers
  * Read support for ABAQUS meshes
  * Many assorted bug fixes

0.7.0 -> 0.7.1
  * Periodic boundary support enhancements
  * New example with subdomain-restricted variables
  * New examples with adjoint-based adaptivity, sensitivities
  * More flexible multiphysics AdjointResidualErrorEstimator norms
  * PatchRecoveryErrorEstimator of directional derivative seminorms
  * Improved VTK output
  * Separate RBEvaluation class for online Reduced Basis solves
  * Object-based assembly API options
  * Partitioning can now use element weights
  * Better support for boundaries with multiple BC IDs
  * More matrix printing options
  * XZ compression support
  * Subset solves with PETSc
  * Better SLEPc compatibility
  * Properly read restart files with a subset of our variables
  * New utility for comparing restart files
  * Easier enabling of float, long double configurations
  * Most features now work with RTTI disabled
  * Many assorted bug fixes

0.6.4 -> 0.7.0
  * Certified Reduced Basis model creation/evaluation
  * Adjoint-based sensitivity calculations and error indicators
  * Support for newer PETSc, SLEPc
  * More autodetection of optional dependencies
  * New examples:
  ** Discontinuous Galerkin
  ** SCALAR Lagrange multipliers
  ** Certified Reduced Basis method
  * Parallel:: utilities for std::set data
  * Parallel:: support for non-default MPI communicators
  * Parallel:: support for non-magic-number message tags
  * GMVIO support for subdomain material ids
  * ExodusII support for writing discontinuous data
  * Switched some example output formats to Exodus, now that GMV is going away
  * More ASCII IO support for variable precision
  * FEMContext utilities are now useable outside FEMSystem
  * Optional BLAS-based dense linear algebra operations
  * Improved fork of GetPot input parsing
  * Support for interior boundary ids
  * Elem::find_edge_neighbors utility
  * Additional patch recovery error estimation norm options
  * Additional SystemNorm functionality
  * Support for zero-dimensional "meshes"
  * Support mesh construction without pre-specified dimensionality
  * Optional independent redirection of libMesh output/error text streams
  * Moved libMesh classes into libMesh namespace
  * More forward declarations, refactoring to reduce header dependencies
  * Fix for an infrequent-but-major I/O-corrupting bug in our libHilbert interface
  * Fix for errors when doing adaptive refinement across a periodic boundary
  * Fix for projections on systems with per-subdomain variables
  * Many fixes for minor bugs, overzealous assertions