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MadGraphControl event_norm fix for [AGENE-1725]

Hannes Mildner requested to merge hmildner/athena:21.6-event-norm into 21.6
  • Force the use of event_norm=average in MadGraph. If the alternative setting is used, Pythia will calculate the wrong cross section once the events are showered [AGENE-1725]. There is an exception for MG versions 2.5.0 to 2.6.0, where we need to use, in some cases event_norm=sum.
  • Fix a bug in is_version_or_newer function

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