Update input samples cmssw 7 2 0 pre4

-         update GEN-SIM input of postLs1 wf's to CMSSW_7_2_0_pre3-POSTLS172_V3-v1; comment out steps needed by HI wf's which make no sense now
-         add ZMM_13 to the set of pileup workflows
-         remove unused releases from the list of processing srings; update workflows, accordingly
-         comment HI workflows which make no sense now