change chapter image location and cleanup dead files

MediaBrowser.Server.Implementations/Library/LibraryManager.cs

@@ -898,6 +898,15 @@ namespace MediaBrowser.Server.Implementations.Library
             return Task.FromResult(true);
         }
 
+        /// <summary>
+        /// Queues the library scan.
+        /// </summary>
+        public void QueueLibraryScan()
+        {
+            // Just run the scheduled task so that the user can see it
+            _taskManager.QueueScheduledTask<RefreshMediaLibraryTask>();
+        }
+        
         /// <summary>
         /// Validates the media library internal.
         /// </summary>