Fix assignment of coordinates for XdmfRectilnearGrid
requested to merge haocheng.liu/vtk:lugia-kun/vtk-release-fix-assignment-of-coordinates-for-xdmfrectilineargrid into master
In conversion of vtkRectilinearGrid to XdmfRectilinearGrid, vtkRectilinearGrid::XCoordinates should be set to XCoords of XdmfRectilinearGrid and vtkRectilinearGrid::ZCoordinates should be set to ZCoords of XdmfRectilinearGrid respectively.
Both XdmfRectilinearGrid and vtkRectilinearGrid use the topology that X (or I) indices varies at first.
It's a rebase of Hajime Yoshimori1's VTK MR !5143