Resolving PFlow muon bug through overlap removal

Commit a first version of the PFlow jet-muon overlap removal tool which resolves the muon bug that muons are sometimes treated as pions and therefore enter jet reconstruction. The bug itself is described in these slides: https://indico.cern.ch/event/807799/contributions/3362328/attachments/1818680/2973610/Presentation.pdf These slides show the effect of the implemented cuts; https://indico.cern.ch/event/814156/contributions/3396841/attachments/1830226/2997072/Presentation.pdf