CMSSW_7_1_40

Changes since CMSSW_7_1_39:

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CMSDIST Changes between Tags REL/CMSSW_7_1_39/slc6_amd64_gcc481 and REL/CMSSW_7_1_40/slc6_amd64_gcc481:

compare to previous

1. 4821 from @SiewYan: backporting sherpa2.2.6 and openloops2.0.0 to 71X created: 2019-03-28 15:02:51 merged: 2019-05-07 17:01:54