Correction patch 157 pour retirer l'index unique (pas de primary key)

cosmogramme/sql/patch/patch_157.sql

 alter table codif_thesaurus change id_thesaurus id_thesaurus VARCHAR(250);
-alter table codif_thesaurus drop primary key ;
+alter table codif_thesaurus drop index indice;
 alter table codif_thesaurus add column id int(11) auto_increment  primary key;