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MG 2.6.7p3.atlas4
MG - fix for problematic cross section reported by madgraph+pythia8 when large fraction of negative event weights 
Sherpa improvements - simplify base fragmants, add base fragment for Lund hadr. switch
Powheg: fix OpenLoop path for ttbb and bblvlv
TestHepMC- add check for valid PDG ID