50 PU card
Support multiple input files
Add IsoTrack to JetStudies Cards
Modify IsoTrackFilter::Finish()

delete newed objects
Add IsoTrackFilter for IsoTrack Selection
Add IsoTrack class for output

For IsoTrack, we include a new tag called IsEMCand. This is a tag of whether
this isotrack is from electron or muon, which is corresponding to e/m PF
candidates as neeeded in SUSY An-2013/089.
Add IsoTrack to Delphes Cards
Revert local changes
Remove my local configs
Merge branch 'clean' of github.com:zhenbinwu/Delphes into Zvertex