New module for thresholding

[Tony Yu]

This came up in a pull request to add
thresholding<https://github.com/scikits-image/scikits-image/pull/98>to
skimage, but I thought it'd be good to move the discussion to the
mailing list.

It doesn't really make sense to add a separate thresholding module, so
where should I put this thresholding function? My proposal is to add a
"levels" module and put thresholding there. Then, for example, we could add
some functions to adjust contrast/brightness/gamma. Someone suggested a
histogram equalization function, which would also fit in a levels module.
On the other hand, "levels" is often used by photo-editing programs to
denote a specific tool for adjusting color/intensity levels.

Thoughts/ideas?

-Tony
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