Remove all include/require parts from classes and use autoload function

Any include or require call is removed and now we use only _spl_autoload
in any class external file include call.
There are three new _DIR vars: LIBDIR, SMARTYDIR, TABLEARRAYDIR that are
based on the __DIR__ and not current working directory.

www/libs/Class.DB.IO.inc

@@ -353,7 +353,7 @@
 				$this->db_debug = $GLOBALS['DB_DEBUG'];
 
 			// includes sub class for db type
-			include_once(LIBS.$this->db_type.'.inc');
+			_spl_autoload($this->db_type.'.inc');
 			$this->db_functions = new $this->db_type();
 
 			// connect to DB