I modified the VTK to VTKm conversion to handle unstructured grids. It 
currently assumes all hexes. I also modified the vtkm contour filter to 
handle unstructured grids.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@27949 18c085ea-50e0-402c-830e-de6fd14e8384