Adding instructions for the SLES15 Installation

[Dooruk]

Documenting progress 📝

Also notice the change in the ~/bin/cylc file and ~./cylc folder.

Thank you @ashiklom for the SLURM config description!

[DavidSRussell]

There are a few things I didn't see mentioned here. To get an experiment to work, I know I had to:

• Use swell create option -p nccs_discover_sles15
• Make sure user has execute permission on $HOME/bin/cylc
• Change existing_jedi_build_directory to /discover/nobackup/projects/gmao/advda/swell/JediBundles/fv3_soca_SLES15/build-intel-release in override.yaml
• Change existing_jedi_source_directory to /discover/nobackup/projects/gmao/advda/swell/JediBundles/fv3_soca_SLES15 in override.yaml

and I'm guessing I also had to:

• Change constraint to mil in $HOME/.swell/swell-slurm.yaml
• Change platform to nccs_discover_sles15 in override.yaml

and I'm guessing $HOME/.cylc/flow/global.cylc is not an executable, so I don't need execute permission on that, right?

[Dooruk]

Thank you so much for your feedback! I added more clarifications on different parts:

* Use `swell create` option `-p nccs_discover_sles15`

I added this in the "practical examples" description.

* Make sure user has execute permission on $HOME/bin/cylc

done

* Change `existing_jedi_build_directory` to `/discover/nobackup/projects/gmao/advda/swell/JediBundles/fv3_soca_SLES15/build-intel-release` in override.yaml 
* Change `existing_jedi_source_directory` to `/discover/nobackup/projects/gmao/advda/swell/JediBundles/fv3_soca_SLES15` in override.yaml

See the "practical examples" description. We define some of these default folders/builds under SWELL source codedeployment/platform/{platform} directories so one should first create a default experiment.yaml before accidentally overriding them.

* Change `constraint` to `mil` in $HOME/.swell/swell-slurm.yaml

We added slurm.yaml file for platform specific entries, see the "SLURM configuration" description.

* Change `platform` to `nccs_discover_sles15` in override.yaml

If you run swell create 3dvar -p nccs_discover_sles15 that is automatically taken care of but you are correct.

and I'm guessing $HOME/.cylc/flow/global.cylc is not an executable, so I don't need execute permission on that, right?

correct