fixed constants and code generator, F_EQ_OR now works

Rev: src/ChangeLog:1.85
Rev: src/docode.c:1.14
Rev: src/interpret.c:1.31
Rev: src/interpret.h:1.11
Rev: src/language.yacc:1.30
Rev: src/lex.c:1.18
Rev: src/lex.h:1.4
Rev: src/peep.c:1.8
Rev: src/peep.in:1.6
Rev: src/program.c:1.26
Rev: src/testsuite.in:1.35