This merge request does the following:
- Raise DRF errors rather than returning response to take advantage of the DRF exception handling mechanism
- Create serialisers for PUT request to simplify the code
- Improve validation checks in several places
- Fixes several issues in DRF infrastructure uses
- Fixes JSON fields handling
- Remove routes that do no fully qualify objects
- Implement a custom DRF exception handler that will allow to log errors
- Improve testing
- Improve permission management