Changes since CMSSW_7_1_27:
- #19133 from @srimanob: Additional test to protect empty LHE
operations - #18954 from @perrozzi: fix LHERunInfoProduct duplication (backport)
generators - #18877 from @alexeybaskakov: ComphepSingletopFilterPy8 input tag bug fix for CMSSW_7_1_X
generators - #18756 from @intrepid42: Powheg-bb4l FSR veto
generators - #18567 from @mkirsano: Compatibility changes of Pythia8Interface for pythia8 226
generators
CMSDIST Changes between Tags REL/CMSSW_7_1_27/slc6_amd64_gcc481 and REL/CMSSW_7_1_28/slc6_amd64_gcc481:
cms-sw/cmsdist@REL/CMSSW_7_1_27/slc6_amd64_gcc481...REL/CMSSW_7_1_28/slc6_amd64_gcc481
- cms-sw/cmsdist#3076 from @cms-sw: Upgrade pythia8 to 226
- cms-sw/cmsdist#3025 from @mrodozov: Updating GeneratorInterface-EvtGenInterface to to new tag V02-00-08