This is my attempt to "fix" the builtin guile lalr parser module.
Plan is to use my syntax but have an external bison executable 
convert the grammar to a parse machine.

TODO: 
1) add `token' expression to lalr2 
2) ucase tokens: e.g., convert lparen to LPAREN 

See lalr2.scm and bison.scm in module/nyacc/.
