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Currently, there is an issue with ecCodes and the Nvidia compiler. As a
workaround, use netCDF output.

Also update to the latest configuration file for JSC.

The set timelimit of 24h includes a safety margin as three months are
only expected to run 18 hours. But a division into 2*3 months seems to
be the safe choice.

We have to double check, if they are acutally required

The model crashed due to high winds in the highest model level

* Restore original simlation duration
* Increase time step
* Decrease number of vertical levels
* Increase output file interval

Both the run script and the number of runs can be passed interactively.

* Switch greenhouse gases to SSP2-4.5 which extends beyond 2020.
  This is required because ICON needs 2021 values to interpolate
  beginning at 2020-07-01.
* Combine SST and sea-ice boundary conditions into a single large file.