Fix 'task id 9' issue.

Adds a message on Admin's Overview page if a task is of an unknown type.
Removes task '9' adding on function.inserttask and ignores task id 9 on
CronJobFunctions.

lib/functions/froxlor/function.inserttask.php

@@ -35,7 +35,6 @@ function inserttask($type, $param1 = '', $param2 = '', $param3 = '', $param4 = '
 	   || $type == '3'
 	   || $type == '4'
 	   || $type == '5'
-	   || $type == '9'
 	   || $type == '10')
 	{
 		$db->query('DELETE FROM `' . TABLE_PANEL_TASKS . '` WHERE `type`="' . $type . '"');