pT balance with dijet system

Zhiyong Yerequested to merge
zhye/Core:DijetBalance into master

Supersedes !146 (closed)

Updates of the code to calculate/validate the dijet pt balance (for the relative correction) and the Z/jet (todo) balance (for the absolute correction).

Using Dijet = Di<Jet,Jet> in getDijetBalance allows us to perform dijet-selection more effectively.

Edited by Patrick Louis S Connor

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