* Added -isZombie to COObject and rules to override -description

* Changed -[ETLayoutItem description] to check -isZombie as needed

* Overriden -checkIsNotRemovedFromContext in ETUIObject as a temporary 
workaround

Note: -discardAllChanges on the default transient object graph context is used 
in the test suite, and discard all the objects due to root absence and shared 
instances being always unreachable (this is the reason behind the workaround).


git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/EtoileUI@10318 7b3f36aa-e6db-49c1-8b4c-66eac1997e64