Make Colorbar more reliable #315
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Fix subtle problems associated with the Colorbar used in
plot_intensities. These problems arose primarily when all intensities were very close to zero, with small numerical roundoff, such that the suggestedcolorrangepair was non-ascending. This PR adds logic to ensure that the suggestedcolorrangeis always strictly ascending. For the special case of uniformly zero intensity, the selected color will correspond to the low end of thecolorrange.