Remove AGP wavefunction

[prckent]

Proposed changes

Remove the AGP wavefunction implementation.

Unfortunately we have no current knowledge of the status of this old implementation, no inputs, no tests, no archived results, and no users are known. Although an up to date and tested AGP implementation would be very welcome, given the age and status of this code, starting from scratch with the batched drivers in mind might be preferred. The old code will remain accessible in the git history and prior releases.

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

• Bugfix
• New feature
• Build related changes

Does this introduce a breaking change?

• Yes

What systems has this change been tested on?

Ubu24, no-mpi build checked.

Checklist

Update the following with an [x] 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.

• • 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)

[ye-luo]

Test this please