Get rid of experimental subdir.

I just stumbled over the experimental subdirectory and read the README file in there. I think the entire directory is not used in the intended way (not even by our release manager) and could straight away die.

The only file in there is an obscure adapter class that bridges between Intersection and IntersectionGeometry written by Jö. @joe, do you still need that file?

Otherwise, the release manager will get rid of it...

Go ahead. I think I used that file at some point to visualize stuff on the domain boundary, but that was probably only for debugging. It is probably quiet bitrotten by now.

mentioned in merge request !9 (merged)

Closed by merging !9 (merged).

Status changed to closed