Fix import

[ericpre]

Progress of the PR

• Fix undocumented API that fall through the cracks in Extend public API and fix documentation #59 and is used in atomap.
• Fix preferences import when hartree-slater GOS as reported in Drop Hartree Slater cross GOS? #20 (comment).
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:exspy build of this PR (link in github checks)
• ready for review.

@CSSFrancis, @jlaehne, I think we should make a patch release straightaway since atomap is using one of these import.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (62a32a3) to head (1f65ac5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
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  Coverage   88.82%   88.83%           
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  Files          77       77           
  Lines        7475     7476    +1     
  Branches     1024     1024           
=======================================
+ Hits         6640     6641    +1     
  Misses        568      568           
  Partials      267      267           

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[jlaehne]

Would an intersphinx link to atomap in the changelog make sense or is that overkill?

[ericpre]

It did cross my mind and I thought that this isn't necessary: for new features, it is convenient, because it send to the relevant part of the documentation but here this is not the case.