contains MRs: https://gitlab.cern.ch/atlas/athena/-/merge_requests/43012 AthenaKernel+AthContainers: remove usage of PACKAGE_VERSION https://gitlab.cern.ch/atlas/athena/-/merge_requests/43045 Corrected some typos and erros in Herwig ART tests https://gitlab.cern.ch/atlas/athena/-/merge_requests/43263 Extended event context retrieval fix in HepMcParticleLink https://gitlab.cern.ch/atlas/athena/-/merge_requests/43299 Pythia8_i Update, master branch (2021.05.07.) https://gitlab.cern.ch/atlas/athena/-/merge_requests/43454 Add Superchic interface https://gitlab.cern.ch/atlas/athena/-/merge_requests/43471 add generator versions env. variable, fixes needed for EVNT-to-EVNT filtering https://gitlab.cern.ch/atlas/athena/-/merge_requests/43484 some corrections to ParticleGun to make it running https://gitlab.cern.ch/atlas/athena/-/merge_requests/43536 Py3 tweaks in Sherpa tarCreator https://gitlab.cern.ch/atlas/athena/-/merge_requests/43592 sync EvgenJobTransorms with 21.6 https://gitlab.cern.ch/atlas/athena/-/merge_requests/43665 fix H7 problem for AGENE-2036, add ART tests for Powheg, add missing components in GeneratorFilters https://gitlab.cern.ch/atlas/athena/-/merge_requests/43731 GeneratorFilters: Fix cppcheck warnings https://gitlab.cern.ch/atlas/athena/-/merge_requests/43755 Master AZNLO CTEQL1 refreshed https://gitlab.cern.ch/atlas/athena/-/merge_requests/43758 add two local ART tests, add GenBase fix needed for running EVNT-To-EVNT filtering https://gitlab.cern.ch/atlas/athena/-/merge_requests/43802 remove hard-coded paths in Sherpa tarCreator https://gitlab.cern.ch/atlas/athena/-/merge_requests/43876 EventInfoMgtInit.py tells the AppMgr to load TagInfoMgr service https://gitlab.cern.ch/atlas/athena/-/merge_requests/43916 update some filters to 21.6 standard, add filer common fragments https://gitlab.cern.ch/atlas/athena/-/merge_requests/43982 Add transient xAOD::EventInfo in EVNT-to-EVNT workflows and enable EventInfoTag https://gitlab.cern.ch/atlas/athena/-/merge_requests/43996 port to master the logging improvements for DiLeptonMassFilter from 21.6