Define content of PersistReco
Follow up to discussion in https://indico.cern.ch/event/1253657/ .
Among others PersistReco currently contains Long and Downstream tracks but not Upstream tracks. This would make it impossible to use them in the Sprucing when using inclusive Hlt2 lines. Should Upstream tracks be part of PersistReco? Other examples are the Velo tracks forming a PV, if these are not added, PV refitting does not work for Sprucing lines. There are probably more examples where it might be beneficial for safety to store them. Of course adding things will make the event size larger.