Another attempt to add Alexey's changes: deltaR cut on ET-NT duplicate electrons, deltaR plot, and adding electron phi's to the RooDataset.
Fix syntax and make a few tweaks to Alexey's DR

Made the following changes:
    * Moves the cut value to the top of the file as NT_DR_
    * Rename variables to better explain what they do
    * Enforce the use of {}, even for single lines
    * Use deltaR instead of a custom solution
    * Remove cout

Also fixed the position of InitTrigger(), which was accidentally reverted
in the commit.