Better image randomizer

[tokee]

To avoid having too many of the same images as pixels for the darker part of the overall image, add a randomizer that also considers images that are not the closest ones in intensity. Maybe use a small counting structure when generating a single tile that raises the probability of randomly selecting a poorer match, when the counts for closest matching pyramids gets high enough?

[tokee]

Partly addressed by dividing Pyramids into buckets defined by grey intensity ranges.