add GRASS green color table by Vincent Bain (see https://trac.osgeo.org/grass/ticket/3043 and https://trac.osgeo.org/grass/ticket/3055)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@68755 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/colors.desc

@@ -14,6 +14,7 @@ etopo2: colors for ETOPO2 worldwide bathymetry/topography
 evi: enhanced vegetative index colors
 fahrenheit: blue to red for Fahrenheit temperature
 gdd: accumulated growing degree days
+grass: GRASS GIS green (perceptually uniform)
 greens: white to green
 grey: grey scale
 grey1.0: grey scale for raster values between 0.0-1.0

lib/gis/colors/grass

@@ -0,0 +1,108 @@
+# Generic green color rule for GRASS GIS
+# designed with the help of matplotlib/viscm utility;
+# interpolated to a 0-100% proportional rule file with the help of interpln()
+# function in SciLab; aimed at providing a basic color ramp complying with
+# (i) a constant delta between adjacent tones and
+# (ii) colorblind users.
+# author: Vincent Bain
+0% 4:49:0
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