Fixes
Add ANS compatible word
Add words for more host-only building; add 9900 assembler
More work 

-- testing whether asm99 can be used
-- see if we can make host-only definitions (nope!)
-- fix bug with stale HEX setting in tests
-- show headers size
Ensure constants & user vars are registered as symbols
Try and comment out Thierry size optimization
Add TestSuccessSymbol and TestFailureSymbol to make tests easier to diagnose; add launches
Simply launches for testing, add rudimentary crash detection
Dump cycle count at exit, experiment with other stack models
Fix DOES>, integrate assembler
Fix jump fixups in host assembler (note: was mainly due to bad BEGIN/UNTIL on host!)
Converted all 9900 prims to FORTH assembly