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Add option for constraining Z+jet response in PerJet

Christopher Young requested to merge cyoung/athena:21.2-JetUncertainties-ZjetResp into 21.2

The new approach to flavour uncertainties uses a constraint on the response in Z+jet events which are used in the in situ calibration. We insist that the flavour uncertainties wouldn't change the response in the quark-gluon mixture present in Z+jet events. This approach will also be used in r22 so we are also targeting this.

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