[rtags] Enhance repr of rtags * we don't care of the class, the registry id is enough (never seen a case of sub-classing) * add the module from which the rtag is coming as well as parent rtag if any.

[web/test] Use bare unittest main instead of lgc.main

[cleanup] Fix some flake8 errors and drop upper bound of copyright along the way. autoform module is not added to flake8-ok-files since there are some remaining errors to be handled, but that's still a start.

[doc] Update the advanced tutorial to follow the new style layout of cubes among others.

[views] Respond with 400 Bad Request in case of validation error in ajax request Previously, we raised a plain RemoteCallFailed without a status code, in which case it defaults to "500 Internal Server Error". Now, for validation errors, we issue a 400 Bad Request since these are clearly client errors.

[web] fix session /cnx mix in anonymized_request

[test] Pin some test dependencies We currently have CI failures because cubes used as test dependencies have been updated to new-style cube layout. To avoid this, pin them to previous released. Those dependencies should be removed but in the mean time this should be enough (and backported in all active branches).

[test] Pin some test dependencies We currently have CI failures because cubes used as test dependencies have been updated to new-style cube layout. To avoid this, pin them to previous released. Those dependencies should be removed but in the mean time this should be enough (and backported in all active branches).