Ops UX Improvements To Install And Init

[TimothyWillard]

Describe your changes.

This pull request:

1. Adds to the output of the install/update command the init command so users do not have to refer to the Initialize The Created flepiMoP Environment documentation, and
2. Changes the init script from a script sourced into the current shell to an executable that launches a subshell.

Does this pull request make any user interface changes? If so please describe.

The user interface changes are how the hpc_install_or_update & hpc_init scripts are invoked. Previously it was (assuming in flepiMoP repository):

./build/hpc_install_or_update.sh <cluster-name>
source batch/hpc_init.sh <cluster-name>

Now this is done with:

./build/hpc_install_or_update <cluster-name>
./batch/hpc_init <cluster-name>

Those are reflected in updates to the documentation in the Running On A HPC With Slurm
documentation. Edits can be seen here: https://github.com/HopkinsIDD/flepiMoP/blob/ad936917742da2db7fe633b17e5bf125e113c35d/documentation/gitbook/how-to-run/advanced-run-guides/running-on-a-hpc-with-slurm.md.

What does your pull request address? Tag relevant issues.

This pull request addresses GH-417 and #375 (comment).

Tag relevant team members.

@pearsonca, @saraloo

[TimothyWillard]

@pearsonca and @saraloo This PR is meant to address the discussion on GH-375 from this morning. I've made it a draft since I'm not sure we want to include this release cycle since this is a breaking change with Wednesday being the target deadline for merging. However if this improves ops UX and others do not object to this change we can push it forward.

[emprzy]

I'm not sure how useful this would actually be because longleaf and rockfish are so specific to their respective institutions, but does it potentially add any value to include relevant notes on how to configure those things/links to UNC/JHU based instructions for those?

[TimothyWillard]

does it potentially add any value to include relevant notes on how to configure those things/links to UNC/JHU based instructions for those?

I don't quite follow, add links to what? There is a documentation page already that covers how to use these scripts: https://iddynamics.gitbook.io/flepimop/how-to-run/advanced-run-guides/running-on-a-hpc-with-slurm, so I don't think adding links to the output of the scripts would be helpful. Do you mean adding links to that documentation to get setup on those HPCs?