add sherpa222, sherpa221 and herwig704 to MCMC mapping

Ligang Xiarequested to merge
ligang/athena:add_sherpa222_to_MCMC into main
  • @kchu noticed sherpa222 is not included in the MC-MC mapping. This is included in this MR.
  • add sherpa221 and herwig704 and use the same ones as their closest partners.

Tag @robouque and also @bdong for a second look! Here I assume sherpa222 uses the same MC-MC SF as sherpa221.

Edited by Ligang Xia

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