Added PdgMass function
Move away generic classes and keep only classes stored in the tree.
Cleanup and double32.
Incorporate updated RefArray (no size template argument anymore) and add necessary caches and cache clear calls
Reworked particle interface to cache FourVectorM
Switched to new Ref class
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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