Disable the 'Found more than one container/composite relationship' constraint for now because it breaks ProjectDemo. See comment in the code

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/EtoileFoundation@10351 7b3f36aa-e6db-49c1-8b4c-66eac1997e64