Added a few #if wxUSE_XXX

Regrouped image format handlers
  Updated the rest accordingly
  Added changes.txt for wxGTK


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2795 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/dirdlgg.h

@@ -54,8 +54,12 @@
 #pragma interface "dirdlgg.h"
 #endif
 
+#include "wx/defs.h"
+
+#if wxUSE_DIRDLG
+
 #include "wx/dialog.h"
-//#include "wx/checkbox.h"
+#include "wx/checkbox.h"
 #include "wx/treectrl.h"
 
 //-----------------------------------------------------------------------------
@@ -116,6 +120,8 @@ class WXDLLEXPORT wxDirDialog: public wxDialog
     void doSize();
 };
 
+#endif
+
 #endif
     // _WX_DIRDLGG_H_