Add plumbing for the SceneObjectDeleter to wait for the script engine to

allow final deletion of objects. Meant to support the attach(NULL_KEY) event,

OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs

@@ -910,5 +910,30 @@ namespace OpenSim.Region.Framework.Scenes
             }
             return ret;
         }
+
+        public bool CanBeDeleted()
+        {
+            if (!ContainsScripts())
+                return true;
+
+            IScriptModule[] engines = m_part.ParentGroup.Scene.RequestModuleInterfaces<IScriptModule>();
+
+            if (engines == null) // No engine at all
+                return true;
+
+            foreach (TaskInventoryItem item in m_items.Values)
+            {
+                if (item.InvType == (int)InventoryType.LSL)
+                {
+                    foreach (IScriptModule e in engines)
+                    {
+                        if(!e.CanBeDeleted(item.ItemID))
+                            return false;
+                    }
+                }
+            }
+
+            return true;
+        }
     }
 }