Add lines for the density of infected and infective mosquitoes
dts_lines_YZ(MYZ, pars, Yclrs = "purple", Zclrs = "darkred", llty = 1)a list the output of ramp.dts::parse_deout()
a list that defines an ramp.dts model (e.g.,  generated by dts_setup())
a vector of colors
a vector of colors
an integer (or integers) to set the lty for plotting