fwd port from 6.4

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@46620 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/colors.desc

@@ -21,6 +21,7 @@ gyr: green through yellow to red
 haxby: relative colors for bathymetry or topography
 ndvi: Normalized Difference Vegetation Index colors
 population: color table covering human population classification breaks
+population_dens: color table covering human population density classification breaks
 precipitation: precipitation color table (0..2000mm)
 precipitation_monthly: precipitation color table (0..1000mm)
 rainbow: rainbow color table

lib/gis/colors/population_dens

@@ -0,0 +1,11 @@
+0 white
+1 255 218 164
+4 255 218 164
+5 255 186 90
+24 255 186 90
+25 205 129 32
+249 205 129 32
+250 139 64 16
+999 139 64 16
+1000 90 4 0
+1000000000 90 4 0