Spambots again :)

[Duke]

We currently have a new spam registration request every 5 minutes on average, some 250 a day. No fun.
So we are experimenting with unconventional methods to keep them out.

On the downside, these experiments will make it a little less convenient for new users to register.
Sorry for the inconvenience.

[Duke]

For technical reasons, I had to
- delete all accounts with status 'waiting for activation' and
- reject all non-approved registration request dating Nov 30 and earlier.

If you are a human and were among those, sorry. You'll have to register again. At least the nick you chose should be available again