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clean weight names before passing GenEvent to Rivet

Christian Gutschow requested to merge cgutscho/athena:21.6_Rivet_weight_patch into 21.6

@akelly has discovered that Rivet3 cannot deal with the non-canonical weight names used by Powheg e.g. in the baseline ttbar sample. Weight names like

' PDF set = 260093 ',

' 0p5muF_2muR_CT14 ',

' nominal '

are really not acceptable, but seeing as the sample cannot easily be re-generated, we will need to clean the weight names before passing the GenEvent to Rivet.

All a bit hacky, but seems to work.

FYI @abuckley @fsiegert @nwarrack @dkar @lcorpe @ewelina

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