launcher checks that stored iteration and checkpoint in <simname>.h5 are
consistent, i.e. <simname>_checkpoint_<checkpoint_value>.h5 contains
field at iteration.
useful when DNS are restarted for various reasons.

also corrects `joint_acc_vel_stats`, in the sense that forcing
parameters should be read beforehand if the acceleration statistics are
to make sense.

not really used now, but I might as well

if stop_<simname> exists, script removes it.

relevant since it also refers to USE_TIMINGOUTPUT etc.

instead of bfps_info or TurTLE_info.