Inconsistent use of dune-subgrid_FOUND and DUNE_HAVE_SUBGRID
CMakeLists.txt on needs to use
dune-subgrid_FOUND while for preprocessor directives
DUNE_HAVE_SUBGRID is used.
Can we unify this such that
DUNE_HAVE_SUBGRID can be always used? This seems to work for
HAVE_UMFPACK, for example.
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