Support in Sim10 for multiple generation algorithms to simulate Beam-Gas + Beam-Beam collisions

Giacomo Grazianirequested to merge
Smog2_MultipleGeneration_final_Sim10 into Sim10

Support for multiple generation algorithms to simulate Beam-Gas + Beam-Beam collisions This is the rebase to Sim10 of branch Smog2_MultipleGeneration_final

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