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

src/common/image.cpp

@@ -834,7 +834,7 @@ bool wxBMPHandler::LoadFile( wxImage *image, const wxString& name )
 
 				      for (i = 0; i < absolute; i++)
 					{
-					   +linepos++;
+					   linepos++;
 					   byte = getc(file);
 					   ptr[poffset] = cmap[byte].r;
 					   ptr[poffset + 1] = cmap[byte].g;