Restore the previous and next links to their former glory.

Squashed commit of the following:

commit 6e788887da9dc91c6deb0e7fc81526592c0f60a5
Author: Adam Harvey <aharvey@php.net>
Date:   Wed Nov 20 11:47:11 2013 -0800

    Move the prevnext-container into the breadcrumbs.

commit d58a00dfbf61e7ff57cd350a64c57ab066141d81
Author: Adam Harvey <aharvey@php.net>
Date:   Wed Nov 20 11:40:09 2013 -0800

    OK, this is minimally functional.

commit 5b4c2e30a27d658d9b5bce4278823277554a2835
Author: Adam Harvey <aharvey@php.net>
Date:   Wed Nov 20 11:38:40 2013 -0800

    Various fixups.

commit 8bb763d18ac8c0d47094b1681e5acab8b6365b66
Author: Adam Harvey <aharvey@php.net>
Date:   Wed Nov 20 11:26:25 2013 -0800

    Revert "Kill the next/prev page from the top & move lang chooser"

    This reverts commit f613c040783ce882cc3c008e9f5fdf3cb6306037.

    Conflicts:
    	include/header.inc
    	include/shared-manual.inc
    	styles/theme.css
Make the license page suck slightly less.
Fix broken debug code.
Switch to a pure CSS implementation of the responsive menu.
Increment the common.js timestamp.
Kill these rouge views, and simplify the mirrorlisting page
Put the "local" country mirrors at the top too
Bust ALL THE CACHES.
This hasn't been relevant in a long time
Prettify the download page
Reinstate (very small) edit and report bug links on manual pages.
Merge remote-tracking branch 'webarto/master'

* webarto/master:
  Fix FF 1px nav space and IE logo border
Automatically bump the CSS last-modified-timestamps
Fix overflowing search result names (try searching "cairog").
Quiet warning on pages that don't specify custom css.
Apply the extra width mode on large displays across all pages, not just docs.

Fixes bug #66129 (Documentation does not follow the same layout pattern as
other pages).
Update the last modified CSS code to handle non-root working directories.
Shamelessly steal bjori's code to handle JS caching as well.
Add a router file for the built-in webserver

Usage: php -S localhost:8080 .router.php
Fit 3x mirrors per row on big screens