Resdata

Remove legacy Python packages `ert` and `ecl.ecl`.

**Changelog**:

*Features*
* A bug in our tests have been fixed, letting Python 3.9 pass all of them. There might still be uncovered Python 3.9-specific issues still.

*Bugfixes*
* Fix infinite loop when attemping to obtain the current working directory, after it has been removed

*Other notes*
* Minor documentation fixes in `EclSum.iget` and `EclSum.get_days`

Changelog

*Features*
* Add all _ecl_ utilities (applications) to the Linux Python PyPI package. Note that they might get deprecated in the near future. 8d223db64e97f489550b2ef07998272953aa8197

*Bugfixes*
* Python: Fix segmentation fault when using `repr` on an incomplete `EclSum` object. 265dd23808f3987c38802b018f361b2fe0f317a6

*Other notes*
* Refactored tests: They are faster, and more of them are possible to run without Equinor data

Changelog

**Bugfixes:**
- Fix crash in coarse cell groups [1a7ba30ad8c63662fd7a78df5ca0c9eacbbc1821]