`align_image_with_openpnm` not working as intended

[shillcoat]

The function porespy.tools.align_image_with_openpnm() does not actually align a 3D image with one from OpenPNM but instead produces a mirror of it. Replacing this function with a simple call to swap the 'x' and 'z' axes would achieve the desired results: im = np.swapaxes(im, 0, 2)

[jgostick]

It is sooo strange. This used to work, and I don't understand what could possibly have changed. I have to think that we changed something in OpenPNM, but I do see how we could have done that without noticing. I will investigate. FWIW, I have been using the porespy.io.to_vtk function lately since paraview does a better job of rendering these, specifically for small features.

[ma-sadeghi]

@jgostick Indeed, it's strange. What's more strange is that porespy's to_vtk doesn't require swapping, but imageio's volsave does!