made mountains a 'dark' terrain

made labels disappear on end of level

data/terrain.cfg

@@ -205,7 +205,6 @@ name=mountains
 char=m
 red=150
 green=150
-light=true
 [/terrain]
 
 [terrain]

src/playlevel.cpp

@@ -264,6 +264,9 @@ LEVEL_RESULT play_level(game_data& gameinfo, const config& game_config,
 	const config dummy_cfg;
 	display gui(units,video,map,status,teams,theme_cfg != NULL ? *theme_cfg : dummy_cfg);
 
+	//object that will make sure that labels are removed at the end of the scenario
+	const font::floating_label_manager labels_manager;
+
 	gui.labels().read(*level);
 
 	if(first_human_team != -1) {