Fixed 5 bugs in wxImage and Blit

Removed warning messages
  Some more clientdata fiddleing
  Added bitmap support to wxTreeCtrl
  Fixed some bugs in wxTreeCtrl
  Added licence.txt to /docs/gtk/


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@968 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/gtk/licence.txt

@@ -0,0 +1,56 @@
+
+
+wxWindows Library License, Version 3
+====================================
+     
+  Copyright (C) 1998 Julian Smart, Robert Roebling et al. 
+
+  Everyone is permitted to copy and distribute verbatim copies
+  of this license document, but changing it is not allowed. 
+ 
+                          WXWINDOWS LIBRARY LICENSE 
+     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+ 
+  This library is free software; you can redistribute it and/or modify it 
+  under the terms of the GNU Library General Public License as published by 
+  the Free Software Foundation; either version 2 of the License, or (at 
+  your option) any later version. 
+   
+  This library is distributed in the hope that it will be useful, but 
+  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- 
+  TABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library 
+  General Public License for more details. 
+ 
+  You should have received a copy of the GNU Library General Public License 
+  along with this software, usually in a file named COPYING.LIB.  If not,   
+  write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,  
+  Boston, MA 02111-1307 USA. 
+ 
+  EXCEPTION NOTICE 
+ 
+  1. As a special exception, the copyright holders of this library give 
+  permission for additional uses of the text contained in this release of 
+  the library as licensed under the wxWindows Library License, applying 
+  either version 3 of the License, or (at your option) any later version of 
+  the License as published by the copyright holders of version 3 of the 
+  License document. 
+ 
+  2. The exception is that you may create binary object code versions of any 
+  works using this library or based on this library, and use, copy, modify, 
+  link and distribute such binary object code files unrestricted under terms 
+  of your choice. 
+ 
+  3. If you copy code from files distributed under the terms of the GNU 
+  General Public License or the GNU Library General Public License into a 
+  copy of this library, as this license permits, the exception does not   
+  apply to the code that you add in this way.  To avoid misleading anyone as 
+  to the status of such modified files, you must delete this exception 
+  notice from such code and/or adjust the licensing conditions notice  
+  accordingly. 
+ 
+  4. If you write modifications of your own for this library, it is your 
+  choice whether to permit this exception to apply to your modifications. 
+  If you do not wish that, you must delete the exception notice from such 
+  code and/or adjust the licensing conditions notice accordingly. 
+
+