Fix test migration crash waiting to happen due to inferred relations Avoid crashing when a relation definition which is already known (due to being inferred) gets explicitly added. As explained in a comment, this would deserve more thinking, but at least this fixes a test failure with computed relations.

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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