Don't allow someone to attempt to siege themselves.

src/me/ryanhamshire/GriefPrevention/DataStore.java

@@ -1434,6 +1434,7 @@ public abstract class DataStore
 		this.addDefault(defaults, Messages.AlreadyUnderSiegePlayer, "{0} is already under siege.  Join the party!", "0: defending player");
 		this.addDefault(defaults, Messages.NotSiegableThere, "{0} isn't protected there.", "0: defending player");
 		this.addDefault(defaults, Messages.SiegeTooFarAway, "You're too far away to siege.", null);
+		this.addDefault(defaults, Messages.NoSiegeYourself, "You cannot siege yourself, don't be silly", null);
 		this.addDefault(defaults, Messages.NoSiegeDefenseless, "That player is defenseless.  Go pick on somebody else.", null);
 		this.addDefault(defaults, Messages.AlreadyUnderSiegeArea, "That area is already under siege.  Join the party!", null);
 		this.addDefault(defaults, Messages.NoSiegeAdminClaim, "Siege is disabled in this area.", null);

src/me/ryanhamshire/GriefPrevention/GriefPrevention.java

@@ -2399,6 +2399,13 @@ public class GriefPrevention extends JavaPlugin
 				return false;
 			}
 
+                        // First off, you cannot siege yourself, that's just
+                        // silly:
+                        if (attacker.getName().equals( defender.getName() )) {
+                            GriefPrevention.sendMessage(player, TextMode.Err, Messages,NoSiegeYourself);
+                            return true;
+                        }
+			
 			//victim must not have the permission which makes him immune to siege
 			if(defender.hasPermission("griefprevention.siegeimmune"))
 			{

src/me/ryanhamshire/GriefPrevention/Messages.java

@@ -66,6 +66,7 @@ public enum Messages
     AlreadySieging,
     NotSiegableThere,
     SiegeTooFarAway,
+    NoSiegeYourself,
     NoSiegeDefenseless,
     AlreadyUnderSiegePlayer,
     AlreadyUnderSiegeArea,