Added IsTopLevel() as a virtual function.

Added fontenum.hto filelist.txt,
  Changed window positioning code again,
  some more related things.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4372 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -338,7 +338,7 @@ public:
     inline wxWindow *GetGrandParent() const;
 
         // is this window a top level one?
-    bool IsTopLevel() const;
+    virtual bool IsTopLevel() const;
 
         // it doesn't really change parent, use ReParent() instead
     void SetParent( wxWindowBase *parent ) { m_parent = (wxWindow *)parent; }