Roskind grammars

Yacc-based parsers for C and C++ by Jim Roskind. It does not use the %prec and %assoc YACC features so conflicts are never hidden. The C grammar has only one shift-reduce conflict, the C++ grammar has a few more. With byacc it can produce graphical parse trees automatically. The C grammar conforms to ANSI C and the C++ grammar supports cfront 2.0 constructs.