Resolve "hadronic interactions with pythia8"

Closes #149 (closed)

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• c82ca48c - added interaction process for pythia

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• 7714fb46 - added proton beam in hydrogen atmosphere example

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Technically it works. The events, i.e. the processes that are active, may be complete garbage. We would have to find a good min bias tune or something. But maybe thats for the future.

Also Pythia does not do kaon interactions, so for a useful high energy shower we would need to be able to use two interaction processes in the sequence.
Technically that works, I.e. we can have auto sequence << p0 << pythia << sibyll but then sibyll also does the pions because the crosse section is larger in sibyll than in pythia.

We need a smart way to configure specific models in the sequence for specific phase-space, e.g. we can add a method "IsApplicable(Particle& p, Trajectory& t)" to each process, and the process sequence, when calculating cross-sections and lifetimes, automatically only includes the desired processes. Then you could easily configure pythia for "kaons and fancier stuff" only.

But this is a new Issue, right? If there is nothing more, you should close 149 and we discuss the rest somewhere else.

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• 7714fb46...897f1a8c - 36 commits from branch master
• 37126492 - Merge branch 'master' into '149-hadronic-interactions-with-pythia8'

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unmarked as a Work In Progress

mentioned in commit 1899c726

merged