AT R24 Updating handling of FTAG MC/MC SFs in AnalysisTop
This MR adds sherpa2212 and amcatnloherwig7to the AnalysisTop FTAG MC/MC shower logic.
Following recommendations from https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/BTagRecommendationsRelease22#Calibration_pre_recommendations
Shower models which are no longer supported (based of these recommendations) are marked as default. For these missing cases, we use default which gives an MC/MC of 1.
Edited by Steffen Korn