Committing the interface change and the addition to the modules to get

the ball rolling on replacable modules. No user functionality yet

OpenSim/Region/OptionalModules/Avatar/Concierge/ConciergeModule.cs

@@ -214,6 +214,11 @@ namespace OpenSim.Region.OptionalModules.Avatar.Concierge
         {
         }
 
+        public Type ReplacableInterface 
+        {
+            get { return null; }
+        }
+
         public override string Name
         {
             get { return "ConciergeModule"; }