Lepton updates
- handle change in PD names for 2018 (for saving electron HLT objects)
- save muon HLT objects for SingleMuon PD
- store loose muon ID (NMuons still counts only medium muons; mediumID mask branch added)
- update electron ID, EA for 2017
- use egamma post reco tool for electron energy correction (2017)
- store corrected ECAL, tracker energy user floats for electrons