/**
  *  Renvoi la liste des modeles de numérotation
  *
  *  @param	DoliDB	$db     			Database handler
  *  @param  string	$maxfilenamelength  Max length of value to show
  *  @return	array						List of numbers
  */
 static function liste_modeles($db, $maxfilenamelength = 0)
 {
     $liste = array();
     $sql = "";
     $resql = $db->query($sql);
     if ($resql) {
         $num = $db->num_rows($resql);
         $i = 0;
         while ($i < $num) {
             $row = $db->fetch_row($resql);
             $liste[$row[0]] = $row[1];
             $i++;
         }
     } else {
         return -1;
     }
     return $liste;
 }