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Adds algorithm to select events based on object flags.

Miha Muskinja requested to merge mmuskinj/athena:21.2_EventSelectionByObjectFlagAlg into 21.2

Reject events based containing objects passing a certain selection criteria. E.g. useful for 'bad muon veto' or 'b-jet veto', etc.. Example usage:

    # Bad muon veto
    alg = createAlgorithm('CP::EventSelectionByObjectFlagAlg', 'BadMuonVetoAlg')
    alg.preselection = '&&'.join(commonCuts)
    alg.veto = '&&'.join(['is_bad,as_char'])
    alg.eventDecisionOutputDecoration = 'has_bad_muon_%SYS%'
    seq.append( alg, inputPropName = {'muons' : 'particles',
                                      'eventInfo' : 'eventInfo'} )
Edited by Miha Muskinja

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