store event vars to output tree
clarify : XaodAnalysis::clearObjects -> clearOutputObjects
retrieve collections once, then cache pointers
add SusyNtMaker::storeElectron
add SusyNtMaker::storeMuon
storeMuon
add SusyNtMaker::storeJet; drop comment sections
storeTau
storePhoton
fillTruthParticleVars, storeTruthParticle
retrieveXaodMet (not working, but compiling)