[linearSolver] Add version check to avoid deprecation warning

* dune-istl has unified SeqILU0 and SeqILUn to SeqILU

dumux/linear/seqsolverbackend.hh

@@ -30,6 +30,7 @@
 #include <dune/istl/solvers.hh>
 #include <dune/istl/superlu.hh>
 #include <dune/istl/umfpack.hh>
+#include <dune/common/version.hh>
 
 #include <dumux/common/parameters.hh>
 #include <dumux/common/properties.hh>
@@ -177,7 +178,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILUn<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::BiCGSTABSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solve<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());
@@ -365,7 +370,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILUn<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::CGSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solve<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());
@@ -587,7 +596,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILU0<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::BiCGSTABSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solveWithILU0Prec<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());
@@ -623,7 +636,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILU0<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::CGSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solveWithILU0Prec<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());
@@ -660,7 +677,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILU0<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::RestartedGMResSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solveWithILU0PrecGMRes<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());
@@ -698,7 +719,11 @@ public:
     template<int precondBlockLevel = 1, class Matrix, class Vector>
     bool solve(const Matrix& A, Vector& x, const Vector& b)
     {
+#if DUNE_VERSION_NEWER(DUNE_ISTL,2,6)
+        using Preconditioner = Dune::SeqILU<Matrix, Vector, Vector, precondBlockLevel>;
+#else
         using Preconditioner = Dune::SeqILUn<Matrix, Vector, Vector, precondBlockLevel>;
+#endif
         using Solver = Dune::RestartedGMResSolver<Vector>;
 
         return IterativePreconditionedSolverImpl::template solveWithGMRes<Preconditioner, Solver>(*this, A, x, b, this->paramGroup());