support visualizing higher order fields with paraview

[cwsmith]

See

meshFields/src/MeshField.hpp

Lines 190 to 198 in ab09a10

	// FIXME support 2d and 3d and fields with order>1
	template <typename Field> void writeVtk(Field &field) {
	using FieldDataType = typename decltype(field.vtxField)::BaseType;
	// HACK assumes there is a vertex field.. in the Field Mixin object
	auto field_view = field.vtxField.serialize();
	Omega_h::Write<FieldDataType> field_write(field_view);
	mesh.add_tag(0, "field", 1, Omega_h::read(field_write));
	Omega_h::vtk::write_parallel("foo.vtk", &mesh, mesh.dim());
	}