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Add option to use powhegLHEReader for Herwig7 in Herwig72ConfigLHEF.py

Dominic Hirschbuehl requested to merge dhirsch/athena:21.6.39_Herwig7dev into 21.6

Added an option to Herwig7Config.lhef_powhegbox_commands(..) to use a special LHEReader to Herwig7, which is able to propagate multiple event weights. The actual reader has to be delivered via a gridpack.

This is urgently needed for a new Powheg+Herwig7 W sample

Tagging @ewelina

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