[Pagination] Jump directly to a specific page no.

[rishifter]

On sites with a lot of entries, especially ones which are actively being edited, it'd be immensely helpful to be able to jump to specific pages. The current system only allows for navigating by one page in either direction.

As a workaround, we've temporarily advised a client to modify the URL to go to a specific page. But that solution is not very elegant or idiot-proof, and they can only do it second page onwards.