extracted VTKSequenceWriter from feature/petsc_backend branch

src/amdis/io/VTKSequenceWriter.hpp

@@ -45,6 +45,7 @@ namespace AMDiS
       : VTKSequenceWriter<GridView>(std::make_shared<VTKWriter>(gridView, FWD(args)...))
     {}
 
+    virtual ~VTKSequenceWriter() = default;
 
     /// accessor for the underlying VTKWriter instance
     std::shared_ptr<VTKWriter> const& vtkWriter() const