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/wfstream.h

@@ -16,6 +16,10 @@
 #pragma interface "wfstream.h"
 #endif
 
+#include "defs.h"
+
+#if wxUSE_STREAMS && wxUSE_FILE
+
 #include <wx/object.h>
 #include <wx/string.h>
 #include <wx/stream.h>
@@ -79,3 +83,7 @@ class wxFileStream: public wxFileInputStream, public wxFileOutputStream {
 };
 
 #endif
+  // wxUSE_STREAMS && wxUSE_FILE
+
+#endif
+  // _WX_WXFSTREAM_H__