[querier] introduce RepeatList class, used to optimize size of data returned for result set description When rql query has no ambiguity, we used to return the same description * N where N is the size of the result set. Returning RepeatList class avoid that multiplication. According to quick benchmark this improve performance for result set whose size is ~ > 50, has very small penalty for rset < 50, and in any case improve the size of data to be transfered over the network through pyro connection.

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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