Util for reordering axes in an NDCube

[DanRyanIrish]

Description

A request has been made for a tool that reorders the axes of an NDCube. Similar to numpy.roll?

[DanRyanIrish]

@rosteen, would like to elaborate a little on this request?

[rosteen]

Essentially, my use case is that I'm making sure one can initialize a Spectrum1D by inputting an NDCube object, and Spectrum1D demands that the spectral axis be last. So I was looking to be maximally lazy and save a couple lines of code if a function to simultaneously reorder both the data array and wcs existed.

It's not a big deal for me to handle reordering the axes in a slightly more manual fashion if the input isn't already in the right order, so I'd personally rate this as a lower priority "nice-to-have".