Use btag SF derived on QCD, without ttbar data, as recommanded.
Fix crash when private constructor
Use JEC uncertainties from global tag by default
add more muon ID
add more electron ID
add support for PU jet ID
catch up the ID and isolation informations from Pat
save p4 generated jet
add a doLooseJetID flag to keep only loose jets or not
add pixel seed information
remove printed comments
retrieve both CutBasedId and FullId idFlag for PUJetId
store raw jets P4
add callbacks for beginJob/endJob
add support for external JEC
add script to generate JEC text files
use latest external JEC
compute sumEt
save unclustered particles
solve merge conflicts