Move db_details_{common,db_info,links}.php to libraries folder as it does not require direct access.

server_privileges.php

@@ -1200,7 +1200,7 @@ if (isset($viewing_mode) && $viewing_mode == 'db') {
 
      // Gets the database structure
      $sub_part = '_structure';
-     require('./db_details_db_info.php');
+     require('./libraries/db_details_db_info.inc.php');
      echo "\n";
 } else {
     require('./libraries/server_links.inc.php');