unique_together integration in CW (alf+syt)
* added in-DB representation of the constraint with a new entity type (CWUniqueTogetherConstraint)
* the schema is now migrated on a sync_schema_props_perms(EType) call in the migration script
* removed the migration commands provided in the first implementation
msgid "read_perm"
msgstr ""
msgid "add_perm"
msgstr ""
msgid "update_perm"
msgstr ""
msgid "delete_perm"
msgstr ""