[devtools] Fix CubicWebTC.temporary_permissions If the context manager is exited via an exception, the original permissions should be restored.

[devtools] Use TestCase.assertGreater

[autoform] fix appearance of link to add inlined creation form On entity creation, if there are some local permissions on the relation, we have no way of checking them since neither the subject nor the object of the relation exists yet. In such a case, we should add the link by default, for consistency (see other places where we use `may_have_permission`). Closes #6711900

[predicates] Simplify specified_etype_implements

[web/views] Fix `has_editable_relation` predicate wrt inlined relations Prevents the "modify" action from being shown when there is nothing to edit.

[web/views] avoid propagation of NoSelectableObject in some case of inlined relations / permissions When selecting an inlined creation form, we should catch the NoSelectable exception that will be raised if the user cannot add entities of the target type (this is not and cannot be verified earlier) or if some other custom selector prevents the form from being selected. Closes #6510921

[server/test] bit of PEP8

[migration] don't attempt to carry over values when renaming a computed relation Without the fix in migractions.py, the introduced test crashes with an operational error because of an attempt to write to a non-existing relation table (computed relations are not materialized). Closes #6304946