expanded to 6000 GDD

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@49861 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/colors/gdd

@@ -1,8 +1,9 @@
 0 white
-0.00001 violet
+0.00001 grey
 500 blue
 1000 green
 1500 yellow
-2000 red
-3000 brown
-3500 violet
+2500 red
+4000 brown
+5000 violet
+6000 50 0 0