modify --pileup to work also with premixing; REMIND: take care of DIGIMIXED dataset name, stil to do
add workflow doing the premixing: minBias events overlaid to neutrino gun events
zee workflows working with premixing and DQM only
include a production-like workflow
Configuration/PyReleaseValidation/python/relval_steps.py
recycle 7_0_5 premixed events
baseDataSetRelease to provide premixed process string
baseDataSetRelease to provide premixed process string
add all pu wfs with premixing; new instructions from Mike https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideSimulation#Pre_Mixing_Instructions ; DIGIPREMIX_S2 and DIGIPREMIX_S2:pdigi_valid ; prod-like workflows still broken
separete relval set for premixing
remove premix wfs from pileup set
cleanup of comments and unused fragments
fix typ: self.executeAndRemember
RECOPRMXUP15_PU50 :  no --pileup_input for replay; GEN-SIM only available for in-time event, from FEVTDEBUGHLT previous step
Merge pull request #3897 from franzoni/from-CMSSW_7_0_5_prmix_production

7_0_5 fix ConfigBuilder + premix production