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Use StationaryLinearProblemSolver with matrix free ISTL backends

René Heß requested to merge feature/matrix-free-stationary-problem-solver into master

This merge request makes it possible to use the StationaryLinearProblemSolver in combination with matrix free ISTL backend. Since the apply method for matrix free backends has a different signature than the matrix based one all ISTL backends now derive from a base class that provides both apply methods (dune/pdelab/backend/interface.hh) and a method 'matrixFree' that exports if the solver backend is matrix free or not.

Edited by René Heß

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