Added ObjType to retrieve type of object.
Added IsParton, IsNot and IsGluon.
Make add and set functions for referencing objects accept const pointers
Added: HasMother by given particle pointer method.
Added FindMother and FindDaughter methods.
Include daughter in prinout if "l" is given. Add a couple of useful functions.
Switched to Double32 for position and momentum, switch FourVector to PtEtaPhiMass version
Adding SetPdgId option
Added DistinctMother accessor
Cleanup
Revamped implementation of decay tree classes, started to remove use of Vertex and FitVertex to prepare for removal of these classes
Merged gen and sim particles into new MCParticle class
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