Adding "-nsteps" option to gmx tune_pme command line breaks tuning
All command line arguments that tune_pme does not understand are passed on to the mdrun command line. The latter is used for a quick sanity check whether runs can be executed at all. To make that check quick the option "-nsteps 1" is added to the command line, leading to a double nsteps argument.
Make tune_pme understand the "-nsteps" option. Fixes #1650
All command line arguments that tune_pme does not understand are passed over
to mdrun. For a quick sanity check the mdrun options are used together with the
additional option "-nsteps 1", which then appears twice on the command line.
The solution is to let tune_pme understand the "-nsteps" argument, so that it
only occurs on the mdrun command line at launch time. The option for that was
already there but before called "-simsteps".