update matrix

- replace Extended2015 with DBExtendedPostLS1 (get geometry from db!)
- when using dqmio, set NEW! datatier name to DQMIO (in place of old DQMROOT)
- update _13TeV wf's to pre5 GEN-SIM input; separate 8 TeV wf's in two: the one which is part of the standard relval set and all the other ones, to have flexibilit
- two new workflows GEN-SIM only, to prepare input of pileup workflows which don't have a no-pileup correspondant ; thanks to @fabozzi (ZmumuJets_Pt_20_300 and Zmu
- gen2015 for ZmumuJets_Pt_20_300_13 => get correct GT (thanks to @fabozzi and @ferro)