Create color scheme that can be used across modules

[mlbendall]

PathoStat should have unified color scheme. Plus a way to easily select complementary/contrasting colors.

For example, with abundance barplots, members of the same phylum could be the same base color, OTUs within each phylum can be a shade of that base color. This is easier to read than random/sequential colors for each OTU.

Example from schizophrenia paper:
fig1.pdf