Seperating modifications from Configuration/Generator/python in branch GENSIM_update_7_3_X_merged into new branch for pull request to update Configuration/Generator only. Requested by Giovanni and Josh. added by <nugent@physik.rwth-aachen.de>
For gen-fragments with TuneCUETP8M1 intended for the relval sequence, adding versions without Tauola (excl. 1 leptonic vs 1 hadronic tua pairs combinations ). <nugent@physik.rwth-aachen.de>
Cleaned up import statments to remove Tauola when not needed. <nugent@physik.rwth-aachen.de>
Merge pull request #6737 from inugent/RelVal_Pythia8_update_7_4_X_without_Tauola_option

Rel val pythia8 update 7 4 x without tauola option