use only h5netcdf and not netcdf4 to avoid conflicts

[egouden]

This is a pragmatic solution to the infamous shared HDF5 library issue.

The specific changes are proposed by Junie and might need further review.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.51%. Comparing base (6496432) to head (74aebe3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #310      +/-   ##
==========================================
- Coverage   93.52%   93.51%   -0.01%     
==========================================
  Files          27       27              
  Lines        5572     5568       -4     
==========================================
- Hits         5211     5207       -4     
  Misses        361      361              

Flag	Coverage Δ
notebooktests	0.00% <0.00%> (ø)
unittests	93.51% <100.00%> (-0.01%)	⬇️

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[kmuehlbauer]

@egouden h5netcdf might not be able to read some CfRadial1 files, if they predate netCDF4. So we have to be careful here. I'd like to hear others opinions on that.

Another solution would be to update documentation with some explanation. One more solution would be to make dependencies lazy, so users can install whatever they want.

[egouden]

The installation steps in the contributing guide have been updated to avoid this conflict when running the tests on Linux. See #315.

Installing with pip is more convenient for the user but remains unstable.