added temporary backend developer template dir switch - Please read:

The smartified code as forked from master to 2.0 being outsourced,
now is to find in /include/admin/tplold, which will still be used as
the default backend template dir.
To switch to the new version, please paste the dirs and files of s9y-admin-tpl
as adviced in the readme and reload, but also add a
```php
	// End of Serendipity configuration file
	// You can place your own special variables after here:

	define('SWITCH_TEMPLATE_VERSION', 'true');

```
to the end of your serendipity_config_local.inc.php.

To switch back to the old smartified files, just set a // to the define().

include/admin/overview.inc.php

@@ -41,11 +41,9 @@ if (!is_object($serendipity['smarty'])) {
 }
 
 $serendipity['smarty']->assign($data);
-
-$tfile = dirname(__FILE__) . "/tpl/overview.inc.tpl";
-
+$tpldir = ( !defined('SWITCH_TEMPLATE_VERSION') )  ? 'tplold' : 'tpl';
+$tfile = dirname(__FILE__) . "/$tpldir/overview.inc.tpl";
 $content = $serendipity['smarty']->fetch('file:'. $tfile); // short notation with Smarty3 in S9y 1.7 and up
-
 echo $content;
 
 /* vim: set sts=4 ts=4 expandtab : */