How to resume interrupted simulation runs

[imabug]

Description

If a simulation run is interrupted for some reason (computer restart, PCXMC crashes, etc), there's currently no good way to resume the simulation run where PCXMC left off.

Right now, the Autorun command checks for the existence of a dfR file. If one exists, the current iteration is skipped until the loop reaches a point where there's no dfR file.

If the mGR and dfR files are loaded after each PCXMC run, then this method won't work.

[imabug]

Maybe write some kind of checkpoint file with the current simulation state.

When starting the simulation, check for the existence of the checkpoint file. If it exists, set the simulation parameters and start. Need to figure out how to start the simulation loops at that point.