1813 standalone extract

[hiker]

This is the stand-alone extraction library. Note that I have not added compilation tests (which we can do) to keep the patch smaller.

[codecov[bot]]

Codecov Report

Base: 99.51% // Head: 99.51% // Decreases project coverage by -0.00% :warning:

Coverage data is based on head (3d215e6) compared to base (14e7ce3). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1845      +/-   ##
==========================================
- Coverage   99.51%   99.51%   -0.01%     
==========================================
  Files         269      269              
  Lines       39380    39379       -1     
==========================================
- Hits        39188    39187       -1     
  Misses        192      192              

Impacted Files	Coverage Δ
...c/psyclone/domain/common/extract_driver_creator.py	100.00% <100.00%> (ø)

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[hiker]

This is ready for a first review, but ideally would be done after merging #1831 (which will likely cause some clashes).

Note that the link checking will fail because the links to the standalone library, which I have added, do not exist yet.

[hiker]

I believe the link check is caused by the stand-alone directory missing, which this PR will add. And I don't understand the coverage issue at all (I believe I might have removed one covered line, which might slightly reduce the percentage of covered lines??)

[hiker]

OK, I hope I've fixed all incorrect references to NetCDF. The link-check errors are expected since they point to paths that do not yet exist on master. The coverage issue should just be a hiccup (i.e. removed covered lines --> percentage of covered lines decreases). Ready for first review.