Replaced old wxSizer,

Converted two of wxGTK's standard dialogs to use them,
  Applied two fixes to wxDC code,
  Made wxRadiobox a little smaller,
  Added sizer.h to wx.h


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3325 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/wx.h

@@ -56,6 +56,7 @@
 #include "wx/gauge.h"
 #include "wx/combobox.h"
 #include "wx/layout.h"
+#include "wx/sizer.h"
 #include "wx/memory.h"
 #include "wx/mdi.h"
 #include "wx/scrolwin.h"