Run a number of MD steps according to the settings specified for the current run.
This keyword only requires a single parameter, which is the number of steps to be run:
To run one million steps, just write:
The number of steps should be compatible with some parameters in some other keywords.
We can regard a run as a block of commands from the ensemble keyword to
# the first run ensemble ... # other commands run ... # the second run ensemble ... # other commands run ... # the third run ensemble ... # other commands run ...