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Implementation of GNNC tool

Jennifer Roloff requested to merge jroloff/athena:GNNCTool into 21.2

This MR provides the functionality to use a NN for the global calibration stage of the jet calibrations (replacing the GSC). In addition to the NN, it applies a small pT correction from a histogram, similarly to how this is done for the p-splines in the EtaJES stage.

I have tested that this code replicates the behavior seen in my local implementation of the calibration.

Tagging @cdelitzs @mswiatlo @dportill for their information.

Edited by Jennifer Roloff

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