[Dune] dune-subgrid and release 1.0

[Christian Engwer]

Dear Oliver,

> Does anybody know why this happens?  The tarball works without the
> patch, and the patch works on the trunk.

when using the svn version, autogen.sh creates a symlink to
dune-common/am, which is needed by the Makefile.am files. I guess this
link is missing. I think it will be sufficient to run the autogen
stuff by hand (in all dune-* dirs).

CU Christian