linux australia site upgrade

I spent some time this morning migrating the Linux Australia web site from Drupal 5 to Drupal 6.

This will allow us to use more fancy 3rd party modules to provide extra functionality in the future, for users as well as admins. As an immediate effect, the site should be both somewhat quicker and less likely to overload the VM it runs on, because it now uses memcached to cache content, rather than MySQL.

Up next: tuning the MySQL server.