SUSYTools: update list of supported muon isolation WPs
Updating list of supported muon isolation WPs:
- including new PFlow WPs
- moving to new names and dropping old ones
- setting default in various places: muon iso = Loose_VarRad (previous FCLoose), and ele iso = FCLoose
- see ATLSUSYBGF-533
- following https://twiki.cern.ch/twiki/bin/view/AtlasProtected/RecommendedIsolationWPs?rev=16#Muon_working_points
- ctests not expected to change as these WPs are the same as before, only the naming changes