Class namespace change testing

- move auto loader to lib/ folder (so it doesn't exist in document root)
- Fix a lot of old method names in DB\IO and Form\General, etc
- Fix login with non existing DB set (abort -> exit)
- add getDbEncoding call to DB\IO

www/admin/namespace_test.php

@@ -12,7 +12,7 @@ ob_start();
 require 'config.inc' ;
 DEFINE('SET_SESSION_NAME', EDIT_SESSION_NAME);
 
-echo "CONFIG: ".CONFIG."<br>ROOT: ".ROOT."<br>BASE: ".BASE."<br>";
+echo "DIR: ".DIR."<br>ROOT: ".ROOT."<br>BASE: ".BASE."<br>";
 
 $lang = 'en_utf8';
 $base = new CoreLibs\Admin\Backend($DB_CONFIG[MAIN_DB], $lang);