iscolormap: relax input check - specially in [0 1] range. * scripts/image/iscolormap.m: relax input check. Allow for colormap of class single and values outside the [0 1] range. What to do in the case of values outside the [0 1] will need to be a per-function choice, in order to meet Matlab compatibility. Also, not Matlab supported, a colormap could perfectly be of class integer. * scripts/image/cmpermute.m, scripts/image/cmunique.m, scripts/image/imshow.m: add input check for values outside the [0 1] range.

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