Pierre-Yves David <pierre-yves.david@logilab.fr> [Tue, 02 Feb 2010 18:22:25 +0100] rev 4428
Add a ``schema`` command to cmd ctrl to generate schema image.
This changeset add the new commande and do some refactoring in cwconfig and
schema.py to allow the use of CubicWebNoAppConfiguration with
CubicWebSchemaLoader.