sweep analysis tools from 21.2

Not too much has happened in recent months in 21.2, but it felt worthwhile sweeping the few changes we had.

cc @lheinric @alister

list of commits:

• 0d850b27 Convert unicode to normal string before returning
• c71a97f8 Make EventFlagSelectionAlg init FilterReporterParams
• 6def589d Allow the muon-pflow ORL to be also b-jet aware