binVector
vector of numbers between 1 and length(binVector), each repeated exactly once
This vector will determine the order that increasing y index positions are repeatedly assigned to. For instance, if binVector = c(1,4,7,10,2,5,8,11,3,6,9,12), then y-axis position one will be assigned to a variety in the first bin of years, y-axis position two will be assigned to a variety in the fourth bin of years, ...., and y-axis position thirteen will be assigned again to a variety in the first bin of years. This vector can help minimize overlap of the labelling of varieties, without regard to how the layout affects the edges between varieties, as those edges will be colored faintly.