Changes since CMSSW_6_2_8:
- #3481 from @thuer: Generator update -- Cmssw 6 2 x sherpa2
- #3487 from @mkirsano: Generator update -- move to pythia8 185
- #3280 from @heppye: Cmssw 6 2 x
- #3358 from @alja: Fix bug in locating file path, 62X
- #3391 from @vadler: 62X - update edmPickEvents
- #3175 from @alja: 6_2_X cmsShow -- simplify detection of cmssw environment.
- #3180 from @Martin-Grunewald: Misc fix -- Fix of InputFile
- #3031 from @vadler: 62X - update input RelVals