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Add a test case based on interdoc thesaurus (shortened).

Fix a few things (style, enumerate usage, etc.) along the way.

Since we sometimes expect unicode strings.

drop pref label / alt label facets, they are mostly unusable, auto completion on the plain text field should be prefered

Also extract a build_result_dict() from add_concepts_from_file() on the way, since this code is used
everywhere

closes #2892966

ex :

Concept

\\tSub-concept

Fellow-concept

Separators may be configured.

[schema] add constraint to ensure subject and object of broader_concept and related_concept belong to the same scheme

[cw monkeypatch] fix metagen to avoid crashes when there are some foreign keys in the database, as introduced in cw 3.20.X

This will handle cases where the concept are regularly created rather than
through the import (which uses a no hooks store).

When some scheme is imported, it may be linked to other schemes. Unknown links
(ie that don't match an alreay known concept) are related to ExternalUris
instead of Concept.

The point of this patch is that when some concept is later inserted, we check if
its URI is the same as an ExternalUri, in which case the ExternalUri is deleted
and replaced by the Concept.

Turns importer._create_entity method public as we have now a use-case where we
have to override this method.

[i18n] temporary fix for translation of unicity error message until #5100373 is integrated in cubicweb

Follow-up for 39e22bbc9920.

[entities] define some fetch_attrs to reduce drastically the number of queries to display sub-concepts tab (on scheme or concept)