Fixing use of old names for x and y variables for plotting in plot_bivar_color_by_pt_density_relation.
Fixing use of old names for x and y variables for plotting in plot_bivar_color_by_pt_density_relation.

weecology/macroecotools,davharris/macroecotools,rueuntal/macroecotools,weecology/macroecotools,rueuntal/macroecotools