Feature 928 resolved.

Replace include/mysql.inc.php by include/config_database.inc.php to be independant of database engine
Rename database configurations variables by ones in $conf array.

git-svn-id: http://piwigo.org/svn/trunk@4280 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/include/functions_upgrade.php

@@ -159,7 +159,7 @@ WHERE username = "'.$username.'"
   {
     $query = '
 SELECT u.password, ui.status
-FROM '.$conf['users_table'].' AS u
+FROM '.USERS_TABLE.' AS u
 INNER JOIN '.USER_INFOS_TABLE.' AS ui
 ON u.'.$conf['user_fields']['id'].'=ui.user_id
 WHERE '.$conf['user_fields']['username'].'="'.$username.'"