Moved playSound/Effect(Player, ...) to Player.playEffect(Location, ...) to be consistent, and because the code didn't really do what the Javadoc said.

src/main/java/org/bukkit/World.java

@@ -532,15 +532,6 @@ public interface World {
      */
     public List<BlockPopulator> getPopulators();
     
-    /**
-     * Plays an effect to just one player.
-     * 
-     * @param player the player to play the effect for
-     * @param effect the {@link Effect}
-     * @param data a data bit needed for the RECORD_PLAY, SMOKE, and STEP_SOUND sounds
-     */
-    public void playEffect(Player player, Effect effect, int data);
-    
     /**
      * Plays an effect to all players within a default radius around a given location.
      *