JER smearing and related jet changes

• more use of PAT userfloats for jet properties
• more configurable jet properties producer
• JER smearing and uncertainties w/ latest db file (for main collection and HadTau softJets)
• Python utilities: JetDepot (for JEC/JER uncertainty variations), addJetInfo (easily attach userfloats to jet collection)

Ntuple size for 1000 80X T1tttt events increases from ~10M to ~13M from extra collections for JER uncertainties