Merge pull request #7 from elenasa/master

Catch up to upstream
Include Makefile.local.mk if it exists
Clean build/test/*.o's
Don't blow compile if no tests
Merge pull request #8 from elenasa/master

Logical Operators; eval test review
Catch up to upstream
Merge pull request #9 from elenasa/master

Immediate Elements for local variables
Catch upstream
Better messaging on missing Makefile.local.mk
Remove UlamDefs.h; use the one in the MFM tree
Merge pull request #5 from DaveAckley/master

Tweaks + exeunt UlamDefs.h