Deprecate TwoPNIProblem, which is not used anymore anyway.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9164 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/boxmodels/2pni/2pniproblem.hh

@@ -53,6 +53,7 @@ public:
      * \param timeManager The time manager
      * \param gridView The grid view
         */
+    DUNE_DEPRECATED_MSG("use PorousMediaBoxProblem instead")
     TwoPNIProblem(TimeManager &timeManager, const GridView &gridView)
         : ParentType(timeManager, gridView)
     {}