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/image/BackedVolatileMirage.java

@@ -48,13 +48,13 @@ public class BackedVolatileMirage extends VolatileMirage
         createVolatileImage();
     }
 
-    // documentation inherited
+    @Override
     protected int getTransparency ()
     {
         return _source.getColorModel().getTransparency();
     }
 
-    // documentation inherited
+    @Override
     protected void refreshVolatileImage ()
     {
         Graphics gfx = null;
@@ -70,7 +70,7 @@ public class BackedVolatileMirage extends VolatileMirage
         }
     }
 
-    // documentation inherited
+    @Override
     protected void toString (StringBuilder buf)
     {
         super.toString(buf);