Merge develop to master

Willi Rathrequested to merge
develop into master

This changes a lot:

  • Example data is not included as a submodule any more.

  • As preprocessing in open_mfdataset is very difficult to get right without creating giant chunks that trigger expensive computes in intermediate steps, there now is xorca.lib.load_xorca_dataset that handles all data and aux files.

  • There are optional tests with real-world data. These optional tests are only run if the contents of https://git.geomar.de/willi-rath/xorca-example-data/ are present in _example_data/.

  • Handling temporary test data has been improved by ensuring that tmp directories are torn down after each test. (This was critical for CI, where a limit on container size prevented larger tests from finishing.)

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