[cmake] use GridUtils to define GRIDTYPE and GRIDDIM

These can be now changed using ccmake. Additionally default to ALUGRID_.
This made HAVE_ALUGRID true in the testcases for me.

CMakeLists.txt

@@ -117,8 +117,11 @@ else(CMAKE_WITH_AUTOTOOLS)
   )
 
   include(DuneUtils)
+  include(GridUtils)
   # configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_config.h.in ${CMAKE_CURRENT_BINARY_DIR}/cmake_config.h )
-
+  if (ALUGRID_FOUND)
+    set(GRIDTYPE "ALUGRID_CONFORM" CACHE STRING "GRIDTYPE" FORCE)
+  endif (ALUGRID_FOUND)
 
   link_directories( "/usr/lib" ${CCGNU_LIBRARY_DIRS} )