BUG: If you submit a comment, you are returned to the page you were commenting. But if you refresh that page, the comment is re-submitted. A "no-cache" and an expire header of the submit request page would avoid this problem.

This is now fixed. Every form now does a redirect afterwards.

(It turned out to be a lot of work. The software used to think in closures and I had to make it be able to think in urls as well.)