repair EPOS interface

The following discussion from !387 (merged) should be addressed:

@rulrich started a discussion: (+3 comments)

@riehn this MR is now finished. EPOS is also fixed. I added a few more unit tests for COMBoost and it looks ok so far. The corsika-modules/epos/check.cpp was also updated to run CRMC collisions. It would be great, if you could run some tests!

Edited Nov 22, 2021 by Felix Riehn

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