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PowhegControl: change pwhg keyword to width_correction and fix LHE header conversion in PowhegControl lhe updater

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

This merge request includes these changes needed for running the inverse width correction with the new bb4l PWHG version:

  • correct the PWHG keyword widthCorrection to width_correction
  • add width_correction to the list of keys for which parallel XML reweighting is allowed (XML reweighting seems to be needed for the inverse width corrections to work)
  • convert byte-string output of ElementTree.tostring(header_new) in lhe_nominal_weight_updater.py to a string such that the header is correctly written out in the final LHE output file (this was discussed in AGENE-2291)

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