CORSIKA module

Merge the CORSIKA repository into SAPPHiRE

This module makes it easy to read CORSIKA DAT files into Python.
Has documentation and example scripts.
It is compatible with CORSIKA with and without the THIN option.

TODO:
- [x] make tests
- [x] check compatibility with the new CORSIKA 7.4
- [x] PEP8 function/variable names
- [x] PEP257 docstrings
- [x] functions to read Run header and end
- [x] qsub, a script to run batch simulations easily

@montanush