Draft: Implement the computation of the "mirror cell" for pile-up corrections
This MR implements two new functors "MirrorID" and "MirrorEnergy" to be applied on neutrals. These functors can be used to compute the pile-up energy corrections in the ECAL. See Chap 5 of https://cds.cern.ch/record/2886547?ln=en for more details.
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"Update the docstring accordingly." -
"Update tests where this functor collection is used as otherwise you will get a mismatch in the set of variables stored in the ntuple."
Edited by Camille Normand