rework of world altitude calculation.

src/engine/devcmd/cmds/ZoneInfoCmd.java

@@ -104,7 +104,7 @@ public class ZoneInfoCmd extends AbstractDevCmd {
         output += newline;
         output += "Sea Level = " + zone.getSeaLevel();
         output += newline;
-        output += "World Altitude = " + zone.getWorldAltitude();
+        output += "World Altitude = " + zone.worldAltitude;
         throwbackInfo(player, output);
 
         City city = ZoneManager.getCityAtLocation(player.getLoc());