Add in @Overrides across the board, clean up the comments around them some, and remove

unneeded imports.
I've got partially completed patches for narya & vilya, too, but nenya was the 
only one that wound up in a decent state after a friday evening puttering at it,
killing time waiting on other things to finish.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@572 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/BackFrameManager.java

@@ -35,7 +35,7 @@ import static com.threerings.media.Log.log;
  */
 public class BackFrameManager extends FrameManager
 {
-    // from FrameManager
+    @Override
     protected void paint (long tickStamp)
     {
         // start out assuming we can do an incremental render
@@ -99,13 +99,13 @@ public class BackFrameManager extends FrameManager
         } while (_backimg.contentsLost());
     }
 
-    // from FrameManager
+    @Override
     protected Graphics2D createGraphics ()
     {
         return _backimg.createGraphics();
     }
 
-    // from FrameManager
+    @Override
     protected void restoreFromBack (Rectangle dirty)
     {
         if (_fgfx == null || _backimg == null) {