Updating relval_steps.py to switch to the pythia8 tune 8CUEP8M1 which is planned for run2
Adding first stages of fixes for missing particle gun routines and patches for broken RelVal sequences
Adding patch for failed relval sequences with pythia8
Removing Tauola from ZpMM* and ZpEE* at Joshes request. Will rename workflows later
Merged RelValPythia8Update from repository inugent
migrate fullsim relvals from pythia8+tauola to pythia8 tau decays
add back tauola where it should not have been removed
migrate a few additional workflows to pythia8
Merge pull request #6886 from bendavid/py8fullsimrelval

Migration of standard fullsim/fastsim relvals to Pythia 8