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Dealing with Multiple McEventCollections

John Derek Chapman requested to merge jchapman/athena:MultipleMcEventCollections_master into master

!20486 (merged) allowed the possibility of HepMcParticleLinks which pointed different McEvenCollection objects within the same event. This merge request adds the code to allow the digitization step to create multiple McEventCollection objects. (One for the hard-scatter and one for each type of pile-up.) It also includes changes to allow FastChain_tf.py to run with pile-up HITS inputs. The code has been kept as similar to the versions in 21.3 as possible to reduce the number of conflicts when future fixes are swept.

Edited by John Derek Chapman

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