Added per world PVP setting support.

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

@@ -132,7 +132,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         if (this.bG > 0) {
             return false;
         } else {
-            if (!this.b.pvpMode) {
+            if (!this.world.pvpMode) { // CraftBukkit this.b.pvpMode -> this.world.pvpMode 
                 if (entity instanceof EntityHuman) {
                     return false;
                 }

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

@@ -57,6 +57,7 @@ public class World implements IBlockAccess {
     private int J = 0;
     public boolean allowMonsters = true; // CraftBukkit private->public
     public boolean allowAnimals = true; // CraftBukkit private->public
+    public boolean pvpMode; // CraftBukkit
     static int u = 0;
     private Set M = new HashSet();
     private int N;

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

@@ -26,6 +26,7 @@ public class WorldServer extends World implements BlockChangeDelegate {
         this.cserver = minecraftserver.server;
         this.world = new CraftWorld(this);
         this.manager = new PlayerManager(minecraftserver, this);
+        this.pvpMode = minecraftserver.pvpMode;
     }
 
     public PlayerManager manager;

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -612,4 +612,12 @@ public class CraftWorld implements World {
     public long getSeed() {
         return world.worldData.b();
     }
+
+    public boolean getPVP() {
+        return world.pvpMode;
+    }
+
+    public void setPVP(boolean pvp) {
+        world.pvpMode = pvp;
+    }
 }