Added three features to make figures more clear:
1) Lines on figure are now plotted so that prcs are behind all other lines, flux lines are on top of them, followed by ecs and finally rcs.
2) Colors for each ratechar plot are now unique to that plot, which means that while one specific reaction will have different colors for each rcplot, there are fewer colors which make colors easier to identify. This together with tweaks to the saturation and value parameters of the colors of the various lines make them much easier to differentiate.
3) Finally, flux max is now the max of the total supply or demand flux and the y axis max is 2*flux max. This gives more white space at the top of the ratechar plots.