Keep color mapping of dirauths/bwauths the same where possible over different sets of graphs
We have colors associated with dirauths/bwauths so we can easier follow the lines on the graphs, which is great. Unfortunately, the mapping changes, e.g. between votes graphs and bwauth graphs. We should keep the mapping consistent where possible: stick to the colors used for the first graph(s) where dirauths/bwauths show up and use those for the respective dirauths/bwauths in later graphs, too.