[Dune] ENABLE_ALBERTA...

[Christian Engwer]

> I would be nice to get some information about the the -DENABLE_ALBERTA, 
> -DENABLE_ALUGRID, -DENABLE_UG switches. Wasn't the prefered strategy to 
> put every thing that has to do with pre processor variables in the 
> config.h header?

No. Everything that can be determined during configure should be put
in config.h. We can not determin whether alberta, alugrid and ug are
used during configure, we can only check for availability.

Christian