* Remapped the Connection shutdown path.

* This fixes a *bunch* of Mantis bugs related to the following
* -- Neighbouring simulators not appearing after relog
* -- Login to simulator only to be logged off by simulator.
* -- ThreadAbort 
* -- Unable to shutdown circuitCode: x

OpenSim/Framework/ClientManager.cs

@@ -111,7 +111,7 @@ namespace OpenSim.Framework
                     if (m_clients.TryGetValue(circuits[i], out client))
                     {
                         Remove(client.CircuitCode);
-                        client.Close();
+                        client.Close(false);
                     }
                 }
                 catch (System.Exception e)

OpenSim/Framework/IClientAPI.cs

@@ -572,7 +572,7 @@ namespace OpenSim.Framework
 
         void SetDebug(int newDebug);
         void InPacket(Packet NewPack);
-        void Close();
+        void Close(bool ShutdownCircuit);
         void Kick(string message);
         void Stop();
         event ViewerEffectEventHandler OnViewerEffect;