Button to clear errors

[Tjoene]

In pasts versions (prior to v3), the error messages were cleared every time you closed the popup.

This feature was very useful when we were debugging out page, and we wanted to see if new errors occurred.
Because we are working with frames, our main page isn't being refreshed when we call a new sub-frame from the menu. This results in an icon that is always red (indicating that an error had occurred) and full of errors, but that aren't relevant anymore to us.

Would it be possible to clear the list again, or add a button so we can manually clear the messages?