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

src/common/datstrm.cpp

@@ -17,13 +17,15 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+  #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include "wx/defs.h"
+  #include "wx/defs.h"
 #endif
 
+#if wxUSE_STREAMS
+
 #include "wx/datstrm.h"
 
 // ---------------------------------------------------------------------------
@@ -200,3 +202,7 @@ void wxDataOutputStream::WriteDouble(double d)
 #endif
   Write(buf, 10);
 }
+
+#endif
+  // wxUSE_STREAMS
+