Decorate tracks with lepton ID
As discussed in #41 (closed), this is a first step to adding reco lepton information to the TDD.
Instead of writing out the a separate reco_leptons
block, with the full lepton parameters, we instead just decorate the tracks used to build each lepton with the lepton ID. Tracks not used in the reconstruction of a lepton get a leptonID = 0
Edited by Samuel Van Stroud