[release,cmake] Fixes installation of checkgeometry.hh

As we prevent processing the test directories during make all,
the installation directives need to be outside of this directory.
This pacth moves them one directory layer up.
[release,automake] Corrects installation directory of refinement documenation.

When the refinement code was move from dune-grid to dune-geometry, this
was never reflected in the installation directories of the documentation.
It still got installed under share/doc/dune-grid. This patch fixes this
and it is finally installed where it is supposed to be, share/doc/dune-geometry.