Structured grid writer and data collector extended to support YaspGrid and SPGrid

dune.module

dune/vtk/datacollector.hh

dune/vtk/datacollectors/continuousdatacollector.hh

dune/vtk/datacollectors/discontinuousdatacollector.hh

dune/vtk/datacollectors/quadraticdatacollector.hh

dune/vtk/datacollectors/spdatacollector.hh

dune/vtk/datacollectors/structureddatacollector.hh

dune/vtk/datacollectors/yaspdatacollector.hh

dune/vtk/vtkimagedatawriter.hh

dune/vtk/vtkimagedatawriter.impl.hh

dune/vtk/vtkstructuredgridwriter.hh

dune/vtk/vtkstructuredgridwriter.impl.hh

dune/vtk/vtkunstructuredgridwriter.impl.hh

dune/vtk/vtkwriter.impl.hh

src/structuredgridwriter.cc