[Pharo-project] [update 2.0] #20276

[Esteban Lorenzano]

20276
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Issue 6560:     [Cleanup]: SystemVersion
        http://code.google.com/p/pharo/issues/detail?id=6560
        
 Issue 6576:    Some MC enh from Squeak
        http://code.google.com/p/pharo/issues/detail?id=6576
        
 Issue 6629:    Update FileSystem comments
        http://code.google.com/p/pharo/issues/detail?id=6629
        
Issue 6631:     Order of classes and traits in fileOut are wrong
        http://code.google.com/p/pharo/issues/detail?id=6631