mark less relevant dots red

The only thing that is actually sensible is that below jnd 1
it does not really matter. The other cases should not play a role
in practice.
un-distort scatterplot

because the length was not evenly distributed. This is hard to avoid completely
but it should no longer be significant or noticeable now.
add the Teuling et al colormaps

Some problems concerning reproducibility may be found in the description of the maps.
I did not add a colorspace enum this time as I did not see the benefit, maybe remove it?
add median-based lines to analysis view
Merge pull request #5 from simonthum/master

Teuling maps and some miscellany