Update for 1.6.5

src/main/java/net/minecraft/server/SecondaryWorldServer.java

@@ -0,0 +1,10 @@
+package net.minecraft.server;
+
+public class SecondaryWorldServer extends WorldServer {
+    // CraftBukkit start
+    public SecondaryWorldServer(MinecraftServer minecraftserver, IDataManager idatamanager, String s, int i, long j, WorldServer worldserver, org.bukkit.World.Environment env) {
+        super(minecraftserver, idatamanager, s, i, j, env);
+        // CraftBukkit end
+        this.z = worldserver.z;
+    }
+}