Today, April 12 2011 from 20:00 to 23:00 GMT the site/Trac/SVN may be unavailable for some time due to server upgrade. If you encounter problems accessing the site, please try again some 15 minutes later.
Update: the site was unavailable from 08:00 to 18:00 GMT due to unpredicted problems with the server. Sorry for that, we are finally back online.
Thank you for your patience!