Please remove / block user from bugzilla

[Wolfram Sang]

> Very BAD:
> ---------
> Changelog: This fixes bug #4711
> 
> BAD:
> ----
> Changelog: Change the handling of flags X Y Z because this fixes bug #4711
> 
> OK:
> ---
> Changelog: Change a corner case in the handling of flags X Y Z (with tests).
>             This resolve the issue from bug #4711.
> 
> 
> The bug number is *only* additional information. It isn't the 
> justification for a patch and definitely not the sole changelog.

ACK. This was my rationale until two hours ago ;)