Chnages to mono-bitmap code.

Added ConvertToMonoBitmap() to wxImage.
  Minor changes to forty.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5359 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/bitmap.h

@@ -97,6 +97,7 @@ public:
     void SetWidth( int width );
     void SetDepth( int depth );
     void SetPixmap( GdkPixmap *pixmap );
+    void SetBitmap( GdkBitmap *bitmap );
 
     GdkPixmap *GetPixmap() const;
     GdkBitmap *GetBitmap() const;