cms-sw/cmssw CMSSW_5_3

#5672 from @smuzaffar: remove C++11 keywords for 53x generators
#5498 from @franzoni: RequestType RequestPriority for relval submission operations
#5632 from @bendavid: backport of single-step wmLHE+GEN-SIM and two output handling to 53x (ConfigBuilder) operations
#5617 from @bendavid: Backport of GenLumiInfoProduct and associated cross section machinery to 53x generators
#5639 from @bendavid: add (and enable) option to override SPINUP in lhe file for Pythia8 tau decays generators
#5648 from @bendavid: remove C++11 keywords from 53x generators
#5600 from @bendavid: Generator Interface backports for Pythia 8, LHE input, jet matching generators
#5130 from @inugent: backport of TauolaInterface for Tauola 1.1.4 from 7_2_X to 5_3_X generators
#5181 from @apfeiffer1: renamed script with a uniqe name to avoid clashes when installing/using db
#5101 from @smuzaffar: disable running of testUtilitiesStorageFactory and testUtilitiesRFIOAdaptor via scram unittests/runtests
#5026 from @sdevissc: HQ filter 53 x generators
#4736 from @mkirsano: to be compatible with the upgrade to thepeg 1.9.2 and herwigpp 2.7.1 generators
#4609 from @wmtan: Allow option of reading of files with prior releases (for 5_3_X) core

cms-sw/cmsdist#1080 from @smuzaffar: relocate bin/cython and bin/cygdb to use python from path
cms-sw/cmsdist#1078 from @smuzaffar: Add lhapdf6 tool with its dependency keeping it inactive
cms-sw/cmsdist#1063 from @bendavid: Update to Pythia 8.200pre2 (53x)
cms-sw/cmsdist#1002 from @smuzaffar: updated scram and config tags
cms-sw/cmsdist#997 from @smuzaffar: updated to tauolapp 1.1.4
cms-sw/cmsdist#970 from @smuzaffar: updated scram version to V2_2_5 which contains bug fix for firstline comment in BuildFiles
cms-sw/cmsdist#966 from @smuzaffar: scram-project-build: sync with 72x changes
cms-sw/cmsdist#957 from @smuzaffar: use latest config and SCRAM
cms-sw/cmsdist#947 from @smuzaffar: SLC6: upgrade to herwigpp 2.7.1 and thepeg 1.9.2

cms-sw/cmssw CMSSW_5_3_21 on GitHub