this lead to a compiler warning on gcc 4.8 that this case was already
covered by catching std::exception. Since we did the same in both
branches anyway, these statements were not required...
basically the only Dune thing which is still used are the FieldVector
and FieldMatrix classes used by some constraint solvers. Until
something similar goes into opm-core, opm-material must depend on
dune-common...
use 'const' instead to make old compilers happy. the disadvantage is
that you cannot use the normal methods for template specialization,
but this currently should not be a major drawback.
