New Jet PU "3D" correction
This MR implements a new 3D PU correction for pflow jets. The implementation is the result of @privaden QT (see https://its.cern.ch/jira/browse/ATLJETMET-1055 ) The implementation is included in a single header file and is used from the usual JetCalibrationTool Config files in JetRec are updated to make use of this new config. I assume a request to update the calibarea will have to be made in parallel.
Edited by Pierre Antoine Delsart