WIP: Describe array order terminology in 2D, 2D+c, 3D, 3D+c arrays

Still working on it, but just thought I'd check this in so that we can tag it as 0.11.
I had a dream last night (after our discussion) in which someone stacked
panels (frames) on top of one other, with the stack growing towards the
person. The metaphor works for right handed axes!