Update core class include style and smarty test page

All libs/classes have an loop to find the needed previous class file.
Smarty test page included.

www/libs/Class.DB.Array.IO.inc

@@ -38,7 +38,13 @@
 	// as it actually has nothing to do with this one here ? (or at least
 	// put into separete function in this class)
 
-	require_once(LIBS."Class.DB.IO.inc");
+	// try to include file from LIBS path, or from normal path
+	$include_file = 'Class.DB.IO.inc';
+	foreach (array('', LIBS, __DIR__.'/') as $folder)
+	{
+		if (file_exists($folder.$include_file))
+			require_once($folder.$include_file);
+	}
 
 	// subclass for one array handling
 	class db_array_io extends db_io