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Robustness improvements for HepMcParticleLinkCnv_p2.cxx and related TP converters

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

In the case that the standard production workflow is being used then the first event in the McEventCollection is the only one where the eventIndex could exceed the maximum value of unsigned short. In this case we can work around the issue by using an m_mcEvtIndex of zero as a special case, in which m_mcEvtIndex should be interpreted as the position of the GenEvent in the McEventCollection rather than the value of GenEvent::event_number().

Similar changes are made to SiHitCollectionCnv_p3.cxx and TRT_HitCollectionCnv_p4.cxx.

Based on !32478 (merged).

Edited by John Derek Chapman

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