[Pharo-project] [update 2.0] #20282

[Esteban Lorenzano]

20282
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 Issue 6661:    remove Rpackage package from monticello
        http://code.google.com/p/pharo/issues/detail?id=6661
        
Issue 6666:     RPackageSet missing methods
        http://code.google.com/p/pharo/issues/detail?id=6666