addProduct, *Traits moved to dune-matrix-vector

dune/solvers/common/arithmetic.hh

dune/solvers/common/staticmatrixtools.hh

dune/solvers/iterationsteps/blockgsstep.cc

dune/solvers/iterationsteps/linegsstep.hh

dune/solvers/iterationsteps/projectedblockgsstep.hh

dune/solvers/iterationsteps/truncatedblockgsstep.hh

.../solvers/transferoperators/compressedmultigridtransfer.hh

dune/solvers/transferoperators/genericmultigridtransfer.hh