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PowhegControl: postprocessor to include ubexcess_correct weights in LHE

Katharina Voss requested to merge katharin/athena:ubexcess_correct_postprocessor into main

When using the ubexcess_correct 1 setting in powheg.input, the event weights need to be corrected to include separate correction factors for btilde and remnant events The following merge request includes:

  • automatic scheduling of lhe_ubexcess_correct_reweighter and lhe_nominal_weight_updater if ubexcess_correct 1 is set
  • extract the correction factors from the pwgcounter files from stage 4
  • apply the correction factors by changing the event weights saved in the produced LHE

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