Get rid off SuperLU dependency.

[[Imported from SVN: r864]]

istl/paamg/smoother.hh

@@ -6,7 +6,6 @@
 #include <dune/istl/paamg/construction.hh>
 #include <dune/istl/paamg/aggregates.hh>
 #include <dune/istl/preconditioners.hh>
-#include <dune/istl/overlappingschwarz.hh>
 #include <dune/istl/schwarz.hh>
 #include <dune/common/propertymap.hh>
 
@@ -385,6 +384,12 @@ namespace Dune
     };
 #ifdef HAVE_SUPERLU
 
+    // forward dseclarations
+    template<class M, class X, class MO, class A>
+    class SeqOverlappingSchwarz;
+
+    class MultiplicativeSchwarzMode;
+
     template<class M, class X, class TA>
     struct SmootherApplier<SeqOverlappingSchwarz<M,X,MultiplicativeSchwarzMode,TA> >
     {