Support Andes at OLCF: NEXUS and build scripts

[zenandrea]

Please review the developer documentation
on the wiki of this project that contains help and requirements.

Proposed changes

Add Andes to nexus machines.py and add
config/build_olcf_andes.sh
config/load_olcf_andes_modules.sh

Describe what this PR changes and why. If it closes an issue, link to it here
with a supported keyword.

What type(s) of changes does this code introduce?

Delete the items that do not apply

• Build related changes

Does this introduce a breaking change?

• No

What systems has this change been tested on?

Andes

Checklist

Update the following with a yes where the items apply. If you're unsure about any of them, don't hesitate to ask. This is
simply a reminder of what we are going to look for before merging your code.

• Yes. This PR is up to date with current the current state of 'develop'
• No. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• No. Documentation has been added (if appropriate)

[qmc-robot]

Can one of the admins verify this patch?

[prckent]

Thanks Andrea. FYI, please ignore the GitHub Actions CI problem.

Have you done much production with these? I assume yes, but it would be good to learn what you found.

Can you also comment on the smt4 change for Summit?

[prckent]

OK to test

[zenandrea]

Thanks Andrea. FYI, please ignore the GitHub Actions CI problem.

Have you done much production with these? I assume yes, but it would be good to learn what you found.

Can you also comment on the smt4 change for Summit?

Hi @prckent,
I did not extensively use andes, as I don't have many resources there.
I mostly use andes to prepare the wave function (so, pwscf calculations) and then I use summit.
However, I made a few qmcpack calculations on andes, for cross-checking, and it seems to work well.

Concerning the smt4 change on summit, well, that was unintentional.
I noticed some benefit on some of my calculations, but it is fine also to use smt1.

[prckent]

Thanks Andrea.

Merging ahead of release.

[prckent]

OK to test

[ye-luo]

Test this please