[Dune] dune-localfunctions

[Peter Bastian]

Hi developers,

I prepared the new module dune-localfunctions as discussed ot the
meeting on 06 October (up to some details that gave problems). I added
the notes to the file  dune_treffen_061008.txt.

You can now have a look at it and we can start discussion about it.

I still have to adapt my code to these new interfaces, so not everything
is checked so far.

Best,

Peter