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Add decay & parent info from event generator to AnalysisTree data format

Frederic Julian Linz requested to merge f.kornas/cbmroot:genIDs into master

Two additional fields are added to the AnalysisTree MC particle info: (1) Parent ID from the event generator (Unigen field: fParticle.fParent) (2) Decay ID from the event generator (Unigen field: fParticle.fDecay)

This allows access to additional info which would not be available otherwise for some specific decays, i.e. phi & K* decay as its decays products will be treated as "primaries" from geant transport point of few.

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