Refactor ToolTipManager a bit.

* Change ShowTip() point parameter name to where.
* Add a parameterless ResetWindowFrame() overload that get's the current
  where and calls ResetWindowFrame(BPoint where) which does the actual
  work. FrameResized() calls this parameterless ResetWindowFrame()
  method instead of doing the work in that method. This is functionaly
  the same but allows me to call the parameterless ResetWindowFrame()
  elsewhere.

headers/private/interface/ToolTipManager.h

@@ -18,7 +18,7 @@ class BToolTipManager {
 public:
 	static	BToolTipManager*	Manager();
 
-			void				ShowTip(BToolTip* tip, BPoint point,
+			void				ShowTip(BToolTip* tip, BPoint where,
 									void* owner);
 			void				HideTip();