o Simpler '!' support now that the lexer deals with multiple !'s for us.

o Simpler '!' support now that the lexer deals with multiple !'s for us.
o In the case of opFOO, have FOO give a boolean return value and set
  foo_matches in opFOO, not FOO.
o Treat 'ALL' as a string since it gets fill()'d in parse.lex--fixes a
  small memory leak.  In the long run it may be better to just fix parse.lex
  and make ALL back into a token.  However, having it be a string is useful
  since it can be easily passed back to the parent rule if we so desire.