[views] Display attributes in entity creation form based on "add" permission Previously, the "update" permission was used. Hence in case the latter is more restrictive that the "add" permission, an user may not be able to set such an attribute, despite she may have "add" permission on it. As a result of the change of permissions action in `editable_attributes` method (add/update depending on whether the entity is being created or modified), the "eid" attribute would have shown up in the edition form. To avoid this, it is moved in the "hidden" section (where it should arguably belong anyways). Closes #4342844.

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TACHES

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-- écrire objet stocke/manipule les données

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-- extraire tests de chaîne de caractère

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* utiliser sqlite 

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* écrire fonction prend chemin en argument et renvoie contenu

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* extraire tests (chaîne de caractère) de spec 

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* utiliser yams pour schéma