[update 2.0] #20286

20286
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Issue 6665: Improve Nautilus Performance
        http://code.google.com/p/pharo/issues/detail?id=6665
       
Issue 6660: Move Workspace out of StringHolder hierarchy
        http://code.google.com/p/pharo/issues/detail?id=6660
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Marcus Denker -- http://marcusdenker.de