contains MR: update default alternative PDF sets https://gitlab.cern.ch/atlas/athena/-/merge_requests/41670 21.6 save reduced truth particle container to EVNT for pileup minbias samples https://gitlab.cern.ch/atlas/athena/-/merge_requests/41680 Allowing error in MadGraph for 21.6 https://gitlab.cern.ch/atlas/athena/-/merge_requests/41699 Fix to heavy flavour displaced decays https://gitlab.cern.ch/atlas/athena/-/merge_requests/41708 Sweeping !41744 from 21.3 to 21.6. AtlasPyFwdBwdPorts: fix pytest related build problems https://gitlab.cern.ch/atlas/athena/-/merge_requests/41764 MG 2.73, TheHepMC use PathResolver for finding of G4particle_whitelist, correct/add ART tests https://gitlab.cern.ch/atlas/athena/-/merge_requests/41778 add LHE filter, which for old production scheme were placed in MC15JobOptions/topcontrol https://gitlab.cern.ch/atlas/athena/-/merge_requests/41851 add MCTC upgrade from 21.2 and decorate PUTruthParticle containers https://gitlab.cern.ch/atlas/athena/-/merge_requests/41854 run MCTC on original particle https://gitlab.cern.ch/atlas/athena/-/merge_requests/41867 include VBFNLO instead of OpenLoops for H7 https://gitlab.cern.ch/atlas/athena/-/merge_requests/41880 Add Powheg interfaces for all ttW subprocesses https://gitlab.cern.ch/atlas/athena/-/merge_requests/41888 correct MG version https://gitlab.cern.ch/atlas/athena/-/merge_requests/41891