RHadrons Update for stops and sbottoms
This merge request fixes two sets of problems.
First, there were problems in the logic that assigned hadronic interactions to R-hadrons. The problem was essentially that one quark in the light quark system was ignored when calculating the R-hadron properties. This is (surprisingly) a quite good approximation as long as you aren't making extremely heavy R-hadrons, and as long as you don't have stop or sbottom R-mesons, where there is only one light quark in the R-hadron. That's fixed, the list of R-hadron interactions has changed somewhat, and the results change a little bit.
Second, we needed a few minor adjustments to get stop and sbottom R-hadron simulation working. That should all be done. Validation plots have been made and everything.
This MR gets 21.6 back in sync with 21.0 following !23144 (merged)