And yet another flat roof.

[hausdok]

wiki,

I've just edited that link out of your post for the second time. Stick around and prove to us that you can make meaningful contributions to the discussions here. Comments that are really based on your knowledge and aren't cut and pasted from someone else's document or website. Once we believe you aren't a link dropper, we'll allow your link. Until then, the link won't be allowed and if you persist in returning to re-post it you'll find your profile locked.

Ed.