Porting two requested UserHook from 21.6
The following JO
https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/blob/master/800xxx/800030/mc.Py8EG_A14NNPDF23LO_flatpT_Zprime_Extended.py https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/blob/master/801xxx/801271/mc.Py8EG_A14NNPDF23LO_flatpT_Zprime.py https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/blob/master/801xxx/801002/mc.Py8EG_A14NNPDF23LO_Gammatautau_MassWeight.py
need the two UserHooks "mHatReweight" and "ZprimeFlatpT", now ported from 21.6.
Needed in ATLMCPROD-9944
Edited by Jan Kretzschmar