Changing continent's color in PlotEquiMap()
This issue introduces two new options to PlotEquiMap():
- 'col.borders' allows the user to set the color of the border of the continents (instead of the standard black) and
- 'col.lakes' set the color of the lakes and seas inside continents (i.e: Black Sea, Caspian Sea), which is white by default. This second option works only when filled.continents = TRUE. Notice that the inner color of the continents (gray) when filled.continents = TRUE cannot be modified by these options.