mcFlavour NTupleVariable is the same as partonFlavour

[mzarucki]

mcFlavour NTupleVariable is the same as partonFlavour in ntupleTypes.py:

https://github.com/CERN-PH-CMG/cmgtools-lite/blob/80X/TTHAnalysis/python/analyzers/ntupleTypes.py#L180

Similarly in CMSSW Heppy PhysicsTools in autophobj.py:
https://github.com/cms-sw/cmssw/blob/master/PhysicsTools/Heppy/python/analyzers/objects/autophobj.py#L186

as well as several other 'NTupleTypes' files.