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Fix reproducibility in FCS mpt getRand() by using TFCS custom hist classes

Thomas Michael Carter requested to merge thcarter/athena:fix_reproducibility into 21.0

Move to using TFCS custom histogram classes rather than TF1/TF2 in PunchThroughTools PDFcreator.cxx getRand(). Drawing random numbers from TF1/TF2 via getRandom() causes reproducibility issues. New implementation allows for the use of CLHEP random number generator.

Edited by Thomas Michael Carter

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