Upgrade DataTables to version 2

We use DataTables for both:

"Client" side HTML (where the server renders out full HTML and then DataTables provides more functionality over the top).
and
Server side where DataTables loads the data as needed off the server, this allows paging, efficient searches etc
We also use a few extensions for DataTables such as fixed headers (so you can see the header when you scroll).

I was looking to update from DataTables 1.x to DataTables 2.x (it provides better client side searching and layout) but there's an extension we use for pagination that has not been updated
```
See datatable_definition.js $.fn.dataTableExt.oPagination.input = {...}
```
this allows us to jump instantly to a page number. If we try to run it with the current extension code we get "plugin is not a function" JavaScript error.

Looking at the docs for DataTables paging can be customised by enabling/disabling the auto jumping of nearby page numbers, enabling/disabling the previous and next buttons and enabling/disabling of the first/last buttons. No option for auto-jumping to a page number is provided.
https://datatables.net/forums/discussion/78354

The ability to jump to a random page is very useful for testing and we'd rather keep it.
This is not a high priority issue, but the sooner we can update to 2, the sooner we can update the layouts from the horrible dom format to something much more readable. It will also keep us future proof etc.
For now not intending on acting on this issue, just wanted to record it.