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JetMET matching and mapping for resolution studies

Polidamas Georgios Kosmoglou Kioseoglourequested to merge
pkosmogl/Core:main_JetMETmatching into main

JetMET matching algorithm is introduced in a new executable called getJetResponse_JetMETalgo.cc.
This is just a priliminary (ugly) implementation of the matching were we introduce it directly in the main code,
the better solution would be to put it in the dedicated library Core/JEC/interface/matching.h.

In this MR a mapping will be also introduced for the resolution studies to transfer from ptgen to ptrec binning when the
resolution is presented.

The DCB fit should be optimized to efficiently fit all phase space regions quite well. Currently the lower pt bins suffer from
a poor fit quality leading to a not ideal resolution extraction (see blue or green lines in the pdf file plotFitJetResolution_fillResponseGen.pdf)

Additionally in some other cases a too narrow initial range for the Gaussian core may lead to a fit failure (negative values for resolution when trying to extract it..).

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