EXOT4 modifications: clean-up, addition of 201903 VRtrk jet collection and TauJets, removal of `NoEl` jet collections

Following changes are made in the EXOT4 scripts:

• Cleaned up the scripts and removed the commented lines
• Added AntiKtVR30Rmax4Rmin02TrackJets_BTagging201903 collection and some additional variables
• Added TauJets and some TruthTaus variables
• Removed el-jet overlap-removed jet collections (*NoElJets): AntiKt4TrackNoElJets AntiKt4EMTopoNoElJets AntiKt4TruthNoElJets.
  These jet collections are not currently used in any analysis. These collections were built by re-clustering the EMTopo jets after removing the electron (topo) clusters. In the future, it should be done with PFlow jets and the MET calculation has to be fixed.
• Updated the skimming condition. Added requirements on AntiKt4EMPFlowJets and AntiKtVR30Rmax4Rmin02TrackJets

Tagging Exotics derivation contact @guescini