Added OS/2 patches to wxGTK.

Updated docs.
  Added wxMask code.
  Added Sylvain's newest tree ctrl code and sample.
  Corrected wxDC background colour (now as wrong as wxMSW).


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2767 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/bitmap.h

@@ -41,6 +41,10 @@ public:
   wxMask( const wxBitmap& bitmap, int paletteIndex );
   wxMask( const wxBitmap& bitmap );
   ~wxMask();
+  
+  bool Create( const wxBitmap& bitmap, const wxColour& colour );
+  bool Create( const wxBitmap& bitmap, int paletteIndex );
+  bool Create( const wxBitmap& bitmap );
 
  // implementation