awrning about mean plane meshing

doc/BUGS

-$Id: BUGS,v 1.3 2001-06-06 08:47:48 geuzaine Exp $
+$Id: BUGS,v 1.4 2001-08-17 12:02:39 geuzaine Exp $
 
-* Splines are bugged since version 1. Don't use them.
+* All surface meshes are made in a mean plane. If your surface cannot
+be projected into a plane with a 1-to-1 correspondance between the
+nodes, then gmsh will fail. We should mesh in the parametric plane in
+these cases...
 
 * Si la coherence des surfaces n'est pas recouvree en une etape, et
 qu'on fait une seconde passe qui marche, les volumes ne sont pas