[Dune] warnings in grid check

[Christian Engwer]

On Fri, Jan 22, 2010 at 12:13:12PM +0100, Oliver Sander wrote:
> Hi!
> It was an explicit goal to support the entire old numbering in 2.0.
> Therefore we need to test it and cannot simply switch off the tests.
> 

how about the following solution?

- add new tests for all grids
- one test which tests old and new interfaces and disables the
  deprecation warnings
- one test which tests only the new interfaces, with all
  deprecation warnings

Christian