color table for Celsius maps added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@33490 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/colors.desc

@@ -4,6 +4,7 @@ bcyr: blue through cyan through yellow to red
 bgyr: blue through green through yellow to red
 byg: blue through yellow to green
 byr: blue through yellow to red
+celsius: blue to red for degree Celsius temperature
 curvature: for terrain curvatures (from v.surf.rst and r.slope.aspect curvature colors)
 differences: differences oriented colors
 elevation: maps percentage ranges of raster values to elevation color ramp

lib/gis/colors/celsius

@@ -0,0 +1,8 @@
+-30 0 100 50
+-20 0 50 50
+-10 0 0 150
+0 0 0 255
+10 green
+20 yellow
+40 red
+80 red