[Dune] DUNE_AC_INIT

[Christian Engwer]

Dear all,

I am currently working on the long awaited feature of 'private'
dune-modules. This means, that the buildsystem will get the ability
to create all dependency checks on the fly. Therefor I have to work on
some integral parts of the buildsystem. I do test the patches, but
still I can not guarante that nothing get's broken. If you can afford
the time, I kindly ask you to test the changes.

Cheers Christian