[Octave-patch-tracker] [patch #8001] rgb2ind.m: Enable handling of ND images

[Carnë Draug]

Follow-up Comment #3, patch #8001 (project octave):

> The image must now be input as a single RGB array, rather than allowing R,
G, B to be input separately. This was just to simplify the handling of the
inputs, now that there are additional input arguments to be handled. As far as
I can tell, Matlab only allows a single RGB array as an input too. (Let me
know if I'm wrong about this!)

Don't do this. Yes, it complicates the input check, but it will break previous
code without warning. If we are removing this, then it should be deprecated
first.

> Dithering is not implemented yet. I need to do some reading up on that
before I see if I'm capable of adding that.

This should be implemented by calling dither() which is not yet implemented. I
have a working patch of it, but have only implemented the grayscale to binary.

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