robistify DA
compute pt once
optimize sorting, add warning
avoid to trash memory
clean config
remove g
avoid trigonometry
default values for new parameters introduced with PR 5255
Merge pull request #5562 from jpavel/tau_720p6_addingDefaultConfig

RecoTauTag/RecoTau -- Default python values for new parameters introduced with PR 5255 (73x version)
Merge pull request #5490 from VinInn/BetterPrimaryVertex

RecoVertex -- Avoid Nans in primary vertex
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X