simplify and rectify color appearance divergence

to make it simpler to describe and understand. Also, the new worst-case
ratio makes for an interesting topic I guess.
Merge branch 'master' of https://github.com/simonthum/colormap-explorer

Conflicts:
	src/main/java/algorithms/quality/ColorAppearanceDivergence.java
	src/test/java/latex/LatexTableQuality.java