Fixed population graph Y axis

src/analysis/makieplots.jl

@@ -56,9 +56,9 @@ function populationtrends(model::AgentBasedModel)
     update_theme!(palette=(color=cgrad(:seaborn_bright, ncolors),), cycle=[:color])
     f = Figure()
     dates = @param(core.startdate):@param(core.enddate)
+    axlimits = (1, length(dates), 0, maximum(pops[!,:Abundance]))
     ax = Axis(f[1,1], xlabel="Date", ylabel="Population size",
-              limits=((1, length(dates)), nothing), xticks = gettickmarks(dates))
-    #XXX Y axis doesn't reach 0?
+              limits=axlimits, xticks=gettickmarks(dates))
     for s in @param(nature.targetspecies)
         points = @select!(@subset(pops, :Species .== s), :Abundance)
         iszero(size(points)[1]) && continue