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Issue 5836: RPackage reference to MessageSet
http://code.google.com/p/pharo/issues/detail?id=5836
Issue 5827: remove #directoryUrl
http://code.google.com/p/pharo/issues/detail?id=5827
Issue 5834: New MessageList does not show category for implementors
http://code.google.com/p/pharo/issues/detail?id=5834-- Marcus Denker -- http://marcusdenker.de
