had to add field fc_code_label to class FSignature
had to add field fc_code_label to class BlDenotationNode

Need to be careful of bit operations:
on bld_flags

X pass3/sigids
pass4/subst
pass4/findsig
pass5c/allocate
X pass5c/assessible
pass5c/bld_analyze
padd5d/sl_analyze
pass5d/traverse
X pass5d/codegen


Ib grammar tried change '\002' to INSERTIONCHAR
