HP_PRIME PYTHON SYNTAX: HP_PPY

[parisse]

You just need a small subset of Python to run French highschool programs, then it's easy to provide full integration in the calculator, I don't think you can have a full Python that is interoperable with the calculator without very very large changes. And I'm going to add an optionnal feature that I think is useful in an educational context and is not available in Python: declare variable type, and check at sto.