Fixed syntax errors.

Program had various syntax issues. Looks fine now, although it throws
many logical errors due to the use of "Exp" in the Op token declaration.
Logical and syntatical checks pass.

Semantics are wrong, though. My parser has left recursion, which is
forbidden by HACS.
Commented out Exps, Starts work now.

Need to fix left recursion issues with Exps before continuing.