Copy nexus module files by nexus/install

[ye-luo]

Proposed changes

Closes #5764
Instead of installing just nexus/bin files, nexus module files are also copied to the install destination for fully functional nexus scripts like qmca using exactly matched nexus module files.

There are issues remaining around nxs-test copied into the installation. nexus/tests files are not copied.
nexus/install also writes QMCPACK source directory into nxs-test script and make it depending on QMCPACK source.
That can be tackled separately.

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

• Bugfix

Does this introduce a breaking change?

• No

What systems has this change been tested on?

laptop

Checklist

• • I have read the pull request guidance and develop docs
• • This PR is up to date with the current state of 'develop'
• • Code added or changed in the PR has been clang-formatted
• • This PR adds tests to cover any new code, or to catch a bug that is being fixed
• • Documentation has been added (if appropriate)

[jtkrogel]

Why not just copy the whole Nexus repo? It's not heavy. If you want to avoid risk of becoming unsynced for any reason, just use rsync -a --delete ... instead of cp, etc.

[jtkrogel]

I don't understand your comments regarding nxs-test above. Could you explain further?

[ye-luo]

I don't understand your comments regarding nxs-test above. Could you explain further?

This PR only copiesnexus/nexus/*.py not the rest folder content thus now-test won’t work due to missing files under the test folder.

[ye-luo]

Why not just copy the whole Nexus repo? It's not heavy. If you want to avoid risk of becoming unsynced for any reason, just use rsync -a --delete ... instead of cp, etc.

I’m not comfortable copying the whole nexus folder, existing cache can be outdated. CMakeLists.txt under tests also should not be copied.

[ye-luo]

Superseded by #5778