parser-gen-pda.pl add --lib-dir and fix constraint check

PerlClassMaker - Correct the required class name

bin/parser-gen-pda.pl - add --lib-dir option for adding
dirs to @INC. Needed when using --generate-op-pkg and the
grammar has an @use A::Pkg:: wildcard for search for
packages in @INC.

make-grammar-ops.sh - add --lib-dir so the script will
work even when the package has not been installed into
the system's perl dirs.