master
Snapshot of CMSSW_6_2_0_pre8.
Use reco::TrackToTrackingParticleAssociator instead of TrackAssociatorBase
Do not update HepMCProduct in place
Use reco::MuonToTrackingParticleAssociator instead of MuonToSimAssociatorBase
Customize premixing input in step3 with premix_stage2 modifier
Transform VertexAssociatorByTracks from ESProduct to EDProduct