Added scripts for generating certain figures for the publication

Combining plots in Illustrator quickly grew tedious, so I modified the
barcharts.R program to combine certain stacked barcharts into faceted plots
for the publication.

Signed-off-by: Ted Gibbons <ted.codes@gmail.com>
Switched to color blind friendly palette

Signed-off-by: Ted Gibbons <ted.codes@gmail.com>