- definitions and expressions are now grouped (Group(), pyparsing   function), they are parsed and converted to machine trees easier - __parse_expr_v2 is changed to follow the previous change, still   not ready to use until prime-things are done
- definitions and expressions are now grouped (Group(), pyparsing
  function), they are parsed and converted to machine trees easier
- __parse_expr_v2 is changed to follow the previous change, still
  not ready to use until prime-things are done

recski/pymachine,Eszti/pymachine,kornai/pymachine,recski/pymachine,Eszti/pymachine,kornai/pymachine