dune-grid-agfalcke.patch

diff -Naur dune-grid-2.6.0rc1/dune/grid/io/file/vtk/vtksequencewriterbase.hh dune-grid/dune/grid/io/file/vtk/vtksequencewriterbase.hh
--- dune-grid-2.6.0rc1/dune/grid/io/file/vtk/vtksequencewriterbase.hh	2017-12-18 11:20:26.000000000 +0100
+++ dune-grid/dune/grid/io/file/vtk/vtksequencewriterbase.hh	2018-10-26 10:48:43.430388000 +0200
@@ -79,6 +79,10 @@
     {
       vtkWriter_->addCellData(v, name, ncomps);
     }
+    
+    void clear(void) {
+        vtkWriter_->clear();
+    }
 
     /** \brief Adds a field of vertex data to the VTK file */
     void addVertexData (const std::shared_ptr<const typename VTKWriter<GridView>::VTKFunction> &p)