Allow to sort option to Grid without drag & drop function

The sortField is used for order by statement in SQL of a Grid. It was also used for the drag & drop reorder function in a grid view. So it was not possible to use order by for fields like name, date, etc..
Now it's possible to use the order by option without the drag & drop function. You have simple to
add 'allowSort' => "false" option in Plugins "AdminController.php".