Work in progress to update ForthComp to generate 9900 code
WIP: make basic loops, USER, etc. work for 9900 Forth
Implement proper +LOOP
Remove U+LOOP/ULOOP from impl
Roll loop jump into (LOOP) and (+LOOP)
Refactor ANS Forth library, integrate unit tests
More refactoring.  Add ROM defer capability for word extension.
Work in progress: parsing/dictionary words
Add support for "nullary" client; improve F9900 instruction dumping for
Forth
Fix number parsing and allow more arbitrary tests
Some more fixes, EVALUATE nearly working
More work -- remove pre-throw/catch hacks
Improve test validation of stack, make (FIND) work
Avoid NPE
Fix (LFIND) semantics and prim this sucker
Fix inverted immediate check
Update F99b for new tests
Implement ENVIRONMENT? for TESTING checks
Use inlined NEXT for F9900
Fix clobbering of DEFER