FIXES AND SUMMARY IMPROVEMENTS

* Erlang script path defined
* Fixes in code generation: some sliced expressions removed instead of replaced
* Fix guard stacks in CFG generation
* Logic simplification in Node-Result creation process
* Fixed dead clause detection
* Improvements added to summary generation:
    + Function calls associated to a particular formal-out-formal-in summary edge are only repended when the grammar term is created, and not for each added production
    + The list of constraints stacked after an AsteriskConstraint are removed when another AsteriskConstraint is pushed to the stack