plotMVAVars.py script added in order to look into the new MVA vars.
trkKink, caloCompatibility, globalTrackChi2 and trackerLayers MVA vars added into trainLeptonID.cxx and LepMVAFriend.py.
trackerLayers added to the MVA variables.
trkKink, caloCompatibility and globalTrackChi2 added to mu section.
Abillity to open .root files from the argument added to checkTMVAGui.sh