Initial changes to get RHadron simulation working in MC23
RHadron simulation has not been tested properly since MC15, so needs some updates before it will work in recent releases. This merge request gets past some of the initial issues found (ATLASSIM-6687). Further development will be required, but it is easiest to merge what we have now.
Tagging @ewelina, @labruce, @tlari, @mbandier, @mgignac, @dhirsch
Edited by John Derek Chapman