Segfault in CI

[pgierz]

The CI on GitHub Actions runs in Ubuntu, which by default installs a weird NetCDF+HDF5 combination, leading to segfaults. This is now fixed by forcing the h5netcdf engine in xarray when in CI mode (yes, the "lets swap out the library specifically for CI" fix is horrible, but, it works)

Additionally, I rewired the configuration of the tool itself to use the library everett library. There is some documentation in the new config.py module. As a nice bonus, configurable options are auto-magically tabulated in the handbook.

Last failure in CI:

Related to #61

Task run 'save_dataset-08f' - Finished in state Failed('Task run encountered an exception ValueError: freq must be a str or a Resampler object')

[pgierz]

Related: https://github.com/pydata/xarray/issues/444

[pgierz]

This pull request includes several changes to the CI configuration, documentation, and the pymorize application code. The most important changes focus on adding support for HDF5 and NetCDF4, updating documentation, and enhancing the configuration management within pymorize.

CI Configuration Updates:

• Added setup for NetCDF4 with HDF5 support in the CI workflow (.github/workflows/CI-test.yaml).
• Updated environment variables for debugging and backend configuration in CI tests (.github/workflows/CI-test.yaml).

Documentation Enhancements:

• Added everett.sphinxext and everett intersphinx mapping to the Sphinx configuration (doc/conf.py). [1] [2]
• Included a new section for pymorize configuration in the documentation (doc/index.rst, doc/pymorize_configuration.rst). [1] [2]

Configuration Management:

• Introduced PymorizeConfigManager for managing configuration with everett (src/pymorize/config.py).
• Updated pymorize code to utilize PymorizeConfigManager for configuration handling (src/pymorize/cmorizer.py). [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Dependency Updates:

• Added new dependencies everett[yaml] and h5netcdf to setup.py.

Code Enhancements:

• Added critical logging for debugging in load_mfdataset function (src/pymorize/gather_inputs.py).