Wishlist: handle labels properly

[gdevenyi]

I consistently find register to be more comfortable than Display for viewing images, so I end up loading image/label pairs.

Right now labels are a bit clunky because

1. Volume/slice normalization isn't handled properly, so we get floating point numbers
2. A colourmap is applied which makes close numbers hard to distinguish

It would be helpful if register recognized labels as such (or allowed me to apply a fixed colourmap).

Thanks.

[rdvincent]

Parts of this are already there... You can load a .ccd colormap, which can include colors for individual labels if you set it up that way.

Regarding the normalization issues, are there particular files where you see this happening? Can you provide an example? And are you seeing this in the most recent code?