more grass in cave_top biome, add some onions

mapgen.lua

@@ -477,7 +477,8 @@ add_node({"ethereal:mesa_dirt"}, 0.10, {"mesa"}, 1, 100, {"default:junglegrass"}
 add_node({"ethereal:green_dirt"}, 0.25, {"swamp"}, 1, 100, {"default:junglegrass"}, nil, nil, nil, ethereal.swamp)
 
 -- grass
-add_node({"ethereal:cold_dirt"}, 0.1, {"caves_coldtop"}, 180, 265, {"default:grass_2", "default:grass_3", "default:grass_4", "default:grass_5"}, nil, nil, nil, ethereal.alpine)
+add_node({"ethereal:cold_dirt"}, 0.2, {"caves_coldtop"}, 180, 265, {"default:grass_2", "default:grass_3", "default:grass_4", "default:grass_5"}, nil, nil, nil, ethereal.alpine)
+add_node({"ethereal:cold_dirt"}, 0.1, {"caves_coldtop"}, 123, 179, {"default:grass_2", "default:grass_3", "default:grass_4", "default:grass_5"}, nil, nil, nil, ethereal.alpine)
 add_node({"ethereal:green_dirt"}, 0.95, {"grassy"}, 1, 120, {"default:grass_5"}, nil, nil, nil, ethereal.grassy)
 add_node({"ethereal:green_dirt"}, 0.95, {"grassytwo","clearing"}, 1, 140, {"default:grass_5"}, nil, nil, nil, ethereal.grassytwo)
 add_node({"ethereal:green_dirt"}, 0.95, {"jumble"}, 1, 120, {"default:grass_2", "default:grass_3",
@@ -515,6 +516,7 @@ add_node({"ethereal:green_dirt"}, 0.25, {"grassy"}, 1, 100, {"ethereal:onion_4"}
 add_node({"ethereal:green_dirt"}, 0.25, {"grassytwo"}, 1, 100, {"ethereal:onion_4"}, nil, nil, nil, ethereal.grassytwo)
 add_node({"ethereal:green_dirt"}, 0.25, {"jumble"}, 1, 100, {"ethereal:onion_4"}, nil, nil, nil, ethereal.jumble)
 add_node({"ethereal:prairie_dirt"}, 0.25, {"prairie"}, 1, 100, {"ethereal:onion_4"}, nil, nil, nil, ethereal.prairie)
+add_node({"ethereal:cold_dirt"}, 0.15, {"caves_coldtop"}, 123, 180, {"ethereal:onion_4"}, nil, nil, nil, ethereal.prairie)
 
 -- papyrus
 add_node({"ethereal:green_dirt"}, 0.1, {"grassy"}, 1, 1, {"default:papyrus"}, 4, "default:water_source", 1, ethereal.grassy)