Renamed all .inc PHP files to .php and replaced all .inc calls

Because .inc style is deprecated and also dangerious as often not setup
correctly on the server all .inc files have been renamed to .php files.

All internall calls have been udpated.

www/admin/class_test.php

@@ -14,7 +14,6 @@ ob_start();
 // basic class test file
 define('USE_DATABASE', true);
 // sample config
-// require("config.inc");
 require 'config.php';
 // set session name
 if (!defined('SET_SESSION_NAME')) {