Adding tagging to dokuwiki

This wasn't as straight forward as I'd hoped, but we achieved it in < 1 hour.

We used the tag plugin for dokuwiki. Installing this (and its pre-requisite plugins, feed and pagelist) was easy.

Initially I couldn't get the topic feature (that shows pages with a tag) to work - it resulted in a blank page. This was traced to curl not being installed. Doh!

The easy fix was (detailed at the curl site):

1. Get the required binaries (php_curl.dll, libeay32.dll and ssleay32.dll).
2. Ensure the latter two binaries are in the PATH.
3. Uncomment the curl extension in php.ini.