Include core rules as bult-in text in bap

[GoogleCodeExporter]

Should have the core abnf rules come as part of the binary so instead of 
preloading abnf-core.txt 
there's a special --use-core-rules flag.

(This means convincing lex/yacc to scan from a file or a string, so is not a 
*no* no brainer)

Original issue reported on code.google.com by [email protected] on 15 Nov 2007 at 12:17