Resolve "Wrong particle counting in CCollimator with particle-matter interactions-2"

Part of #718 (closed)

changed milestone to %2022.1

added Bug OPAL-cycl labels

@kraus: I continue here !580 (merged) due to an unexpected merge before I could fix last review comment

marked this merge request as ready

approved this merge request

approved this merge request

resolved all threads

added Cleanup label and removed Bug label

mentioned in commit 86291fe7

merged