Major changes in interregion communications. This breaks compatibility with older versions, and may result is all sorts of weirdnesses when interacting with sims in older versions. Changes:

- Introducing synchronous Teleports. Now the receiving region calls back the sending region after the client has been made a root agent there, that is, after client sends CompleteMovement to the destination.
- SendCloseAgent moved from OGS1 Remoting to RESTComms.

OpenSim/Region/Application/OpenSim.cs

@@ -177,7 +177,7 @@ namespace OpenSim
                              presence.UUID,
                              regionInfo.RegionName));
 
-                    presence.Scene.CloseConnection(presence.UUID);
+                    presence.Scene.IncomingCloseAgent(presence.UUID);
                 }
             }
             m_console.Notice("");