Implement read-only IdentityMatrix
This implementation of an IdentityMatrix does not hold any data. It implements a reduced version of the DenseMatrix interface including a standard C++ cast operator to a Dune::FieldMatrix. This code illustrates the new forward capabilities of DenseMatrixAssigner. (cherry picked from commit 64df6274) Signed-off-by:Markus Blatt <markus@dr-blatt.de>
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