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Fix Pythia8 OTF weights for HepMC3

Matthew Gignac requested to merge mgignac/athena:pythia8-hepmc3-weightfix into master

As mentioned in ATEAM-869, we have inconsistent weight vectors. These originate from a mis-match between what is being stored into GenEvent in the Pythia8 HepMC3 convener and what is expected in Pythia8_i. I this MR, we disable the storing of these weights in the Pythia8 HepMC3 converter and instead rely on our Pythia8_i to set these.

Tagging @gpanizzo , @mshapiro , @abuckley, @dhirsch

Edited by Matthew Gignac

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