Fix getting version

[ericpre]

Alternative to #185.

Progress of the PR

• Use fallback_version at build time to define version when necessary version control information are missing (git archive or shallow checkout). When making a new release, the fallback_version will be updated automatically by the prepare_release.py script,
• Use setuptools_scm at runtime only when possible,
• Fix getting version on system wide install on debian/ubuntu
• [n/a] update docstring (if appropriate),
• update user guide (if appropriate),
• 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:rosettasciio build of this PR (link in github checks)
• add tests (check version on CI), also tested manually from git archive,
• ready for review.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (13507d4) 86.02% compared to head (136a7dc) 86.01%.
Report is 26 commits behind head on main.

Files	Patch %	Lines
rsciio/__init__.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   86.02%   86.01%   -0.01%     
==========================================
  Files          81       81              
  Lines       10387    10390       +3     
  Branches     2253     2254       +1     
==========================================
+ Hits         8935     8937       +2     
  Misses        931      931              
- Partials      521      522       +1     

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[ericpre]

@CSSFrancis, @magnunor, can you please have a look at this PR?

[CSSFrancis]

Looks like pretty sound logic to me. @magnunor If you want to test things to make sure that they work as intended for your case that would be good.

My suggestions are just some small documentation things to make it a bit clearer as to what is happening.

[ericpre]

Thank you @CSSFrancis, this was poorly and I was a bit lazy to improve it! 😅 This should be better now!

[CSSFrancis]

Thank you @CSSFrancis, this was poorly and I was a bit lazy to improve it! 😅 This should be better now!

No problem :) I think I'm much worse at that than you are. This looks good to me

[magnunor]

Checking this now!

[magnunor]

That fixed the issue (#184)!