[Mimedefang] Image validator/OCR SA plugin

[Martin Blapp]

> # grep HTML_IMAGE_ONLY /var/log/maillog | wc -l
>   35834

This is wrong. It should have been

# grep "HTML_IMAGE_ONLY.*hits=" /var/log/maillog | wc -l
     17917

> But almost 45% of all mails match HTML_IMAGE_ONLY, so it's unusable
> at all. I even use lower scores for those rules now - which gives
> me less FPS:

22% is still a lot ...

Martin