Arbitrary axis order?

[hameerabbasi]

I just feel it could be beneficial to have an arbirary array order created when creating an array.

Upsides:

• It can be made so that indexing/reducing is faster along any given dimensions, as well as a number of other operations.

Downsides:

• It will touch all sort_indices calls and also all cases where we linearize. Mixed orders will need to be handled carefully.