* refactor: For new objects, move attach to backup to occur when adding to a scene, rather than on creation of the group

* Adding to a scene is now parameterized such that one can choose not to actually persist that group
* This is to support a use case where a module wants a scene which consists of both objects which are persisted, and ones which are just temporary for the lifetime of that server instance

OpenSim/Region/Environment/Scenes/SceneObjectGroup.Inventory.cs

@@ -124,6 +124,7 @@ namespace OpenSim.Region.Environment.Scenes
             }
         }
 
+        /// <summary>
         /// Start a given script.
         /// </summary>
         /// <param name="localID">