Small forum modifications

[Benno]

Small forum modifications are done.

- Advertising page is updated with new forum statisitics.
- Profile page has a counter underneath the signature box.
- Registration page is simplified.
- FAQ put up again.

[Maurice]

You also deleted the possibility to change one's avatar an accident I am sure.

[Benno]

I'll fix that tomorrow. Hadn't noticed it yet, thanks.