Add ZFinderTree to write TTrees from ZFinderEvents
Add ZFinderTree writing to ZDefinitionPlotter
Remove unused z_plotter_map_ from ZFinder
Rename ZDefinitionPlotter to ZDefintionWriter

ZDW now also writes TTrees, so it has been renamed to indicate it's new
function.
Merge branch 'tuples'
Correctly fill truth values in ZFinderTree

The truth values were accidentally being written to the reco branch.
They are now written to the truth branch.
Pulling in Alex's latest changes.
Merge branch 'master' of github.com:UMN-CMS/ZFinder