[Pharo-project] [update 2.0] #20370

[Esteban Lorenzano]

20370
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Issue 6710:     RPackage duplication of extensions
        http://code.google.com/p/pharo/issues/detail?id=6710
        
Issue 6888:     Remove HierarchyBrowser from ToolRegistry
        http://code.google.com/p/pharo/issues/detail?id=6888

Diff information:
http://ss3.gemstone.com/ss/Pharo20/Tools-EstebanLorenzano.966.diff
http://ss3.gemstone.com/ss/Pharo20/RPackage-Tests-EstebanLorenzano.99.diff
http://ss3.gemstone.com/ss/Pharo20/RPackage-SystemIntegration-EstebanLorenzano.153.diff
http://ss3.gemstone.com/ss/Pharo20/RPackage-Core-EstebanLorenzano.197.diff