Sort: Note that the neutral plugin is only suitable for client-side processing

Thanks Martin!

api/order.neutral().js

@@ -5,6 +5,9 @@
  * it can sometimes be useful to restore the original order after sorting has
  * already occurred - which is exactly what this function does.
  * 
+ * Please note that this plug-in can only be used for client-side processing
+ * tables (i.e. without `serverSide: true`).
+ *
  * @name order.neutral()
  * @summary Change ordering of the table to its data load order
  * @author [Allan Jardine](http://datatables.net)