Enabled warnings about 'Duplicate Method Definitions', 'Implicit Atomic ObjC Properties' 
and 'Implicit Synthesized Properties' in all targets


git-svn-id: svn://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@9915 7b3f36aa-e6db-49c1-8b4c-66eac1997e64