NDCube ready to use.

So finally the NDCube was merged in the CubeND branch. It is pretty generic, it has all the stuff I think would make it useful to the Sunpy community. Hoping it get’s used in the Sunpy repository in the future.

Now the work on the CubeSequence to change it to NDCubeSequence, the transition to use NDCube in this new sequence should be smooth. Should not be too much work but you never know. :)

Tests has been the most important and boring thing till now :P. The to_sunpy() method will be hard work, I think.

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