- moving banned check and public/private check to

Scene.NewUserConnection()
- adding reason reporting

this enforces estate bans very early on and prevents us from
circulating client objects that we'd then have to retract once we
realize that the client is not allowed into the region

OpenSim/Region/CoreModules/Hypergrid/HGStandaloneLoginModule.cs

@@ -160,8 +160,9 @@ namespace OpenSim.Region.CoreModules.Hypergrid
             }
         }
 
-        public bool NewUserConnection(ulong regionHandle, AgentCircuitData agent)
+        public bool NewUserConnection(ulong regionHandle, AgentCircuitData agent, out string reason)
         {
+            reason = String.Empty;
             return true;
         }