add isEM for photons, add DR(jet,muon) initialized for new muon SFs

Douglas Michael Schaeferrequested to merge
schae/athena:fjvtpatch into 21.2
  • add isEM for photons for fake photon predictions. value is now labeling the photons, and can be saved.
  • add DR(jet,muon) initialized for new muon SFs. default value of -2 is set. This uses the old muon SFs. This is required to run the newest recommendations.

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