Improve script to run slurm jobs

[lauraporta]

Is your feature request related to a problem? Please describe.
The script I wrote (derotation_slurm_job) could be improved by using submitit to submit job arrays to slurm.
I'd also like to have a more elegant way to parametrise job sumbissions.

Describe the solution you'd like
Less lines of code and less reinventing the wheel.

[lauraporta]

Could also use dask