Starts an MCMC run, as the Simulation Control dialog does when its mode is MCMC. The control file and payoff definition are the ones set with SIMULATE>MCMCPARM and MCMCPAYOFF, not the OPTPARM and PAYOFF files that MENU>RUN_OPTIMIZE uses.
The argument is the same as for MENU>RUN: o overwrites an existing run of that name without asking.
Before this command existed the action recorder wrote MENU>RUN_OPTIMIZE for an MCMC run, which replayed as an ordinary optimization against a different control file and payoff - the run looked plausible and was not the one recorded.
SIMULATE>MCMCPARM|sample.voc
SIMULATE>MCMCPAYOFF|calib.vpd
MENU>RUN_MCMC|o
