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New algorithms to link 'v2' digits/cluster to MCParticle

Gerhard Raven requested to merge alt-calodigit_v2 into master

The actual data is always a relation from CaloCellID -> MCParticle. In case of digits (clusters), the cellID of the digit (seed digit of the cluster) is used.

Note: this implies that it is no longer possible to have a single relation table for multiple containers, as those containers may have entries with the same CaloCellID. Hence, there must be, for each container of digits (clusters), a dedicated relation table to the MC truth!

In addition, there is a Hypo2MCParticle which uses the above cluster 'links' to build an 'old' hypo -> MCParticle relation

supersedes !387 (closed), depends on LHCb!2166 (merged), Rec!1740 (merged), Brunel!960 (merged)

Edited by Gerhard Raven

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