-misc/dgpix.cpp: Marked Elfin as having unemulated protection.

* Elfin will eventually get into a state where it ignores coins.
  Protection is conceptually similar to The X-Files.

-cpu/uml.cpp, cpu/drcuml.cpp: Made it possible to build with logging
 simplifications enabled (in uml.cpp it logs each step, in drcuml.cpp it
 logs the net change).  It will produce absoluely massive logs, though.

-cpu/drcuml.cpp: Removed woefully inadequate and badly rotted "backend
 validation" code.

Author: cuavas