Udata

- Fix fields empty value in admin form to allow for unsetting fields [2691](https://github.com/opendatateam/udata/pull/2691)
- :warning: Add a new required topic string field on reuses. The associated migration set default topic to `others` [2689](https://github.com/opendatateam/udata/pull/2689)

- :warning: Removed `Issues` code and logic. The corresponding MongoDB collection should be deleted when upgrading Udata. [2681](https://github.com/opendatateam/udata/pull/2681)
- Fix transfer ownership from org to user [2678](https://github.com/opendatateam/udata/pull/2678)
- Fix discussion creation on posts [2687](https://github.com/opendatateam/udata/pull/2687)

- Move template hook logic back to udata [2671](https://github.com/opendatateam/udata/pull/2671) [#2679](https://github.com/opendatateam/udata/pull/2679)
- Add dataset's acronym to catalog [2675](https://github.com/opendatateam/udata/pull/2675)
- Better URL-based License guess [2672](https://github.com/opendatateam/udata/pull/2672)
- New way of fixtures generation [2677](https://github.com/opendatateam/udata/pull/2677):
- The command now uses a remote file (default) if a URL is provided or a local one if a path is provided.
- This file can be generated by using the command `generate-fixtures-file`, which takes as an argument the URL of the source queried to retieve the data dumped to the file.
- The command `generate-fixtures-file` uses a customizable list of datasets slugs to know which datasets to query.
- Fixed the Geomform check for a GeoZone instance in formdata [2683](https://github.com/opendatateam/udata/pull/2683)

- Fix default sort with right sort column creation date name, for posts in back-office editorial page [2665](https://github.com/opendatateam/udata/pull/2665)
- Meta read-only-enabled is back [2664](https://github.com/opendatateam/udata/pull/2664)
- First endpoints for APIv2! Add datasets hateoas and resources pagination endpoints [2663](https://github.com/opendatateam/udata/pull/2663) [#2667](https://github.com/opendatateam/udata/pull/2667)
- Add `archived` and `resources_count` fields in the dataset catalog [2668](https://github.com/opendatateam/udata/pull/2668)

- Update dependencies following setuptools 58.0.2 release that drop support for `use_2to3` [2660](https://github.com/opendatateam/udata/pull/2660):
- :warning: **breaking change** `rdfs` is not supported anymore
- `jsonld` endpoints have a `context` dict directly instead of an url to the context endpoint
- Update documentation with [udata-front plugin renaming](https://github.com/etalab/data.gouv.fr/issues/393) [#2661](https://github.com/opendatateam/udata/pull/2661)
- Various DCAT fixes (geonetwork compatibility) and debug command [2662](https://github.com/opendatateam/udata/pull/2662)

- Change udata-gouvfr dependency to udata-front following renaming [249](https://github.com/opendatateam/udata-piwik/pull/249)