implicit branch: add forward declarations to pass make headercheck.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/branches/implicit@9817 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/implicit/common/implicitpropertydefaults.hh

@@ -39,6 +39,10 @@
 
 namespace Dumux {
 
+// forward declarations
+template <class TypeTag> class NewtonController;
+template <class TypeTag> class BoxBiCGStabILU0Solver;
+
 namespace Properties {
 //////////////////////////////////////////////////////////////////
 // Some defaults for very fundamental properties