[Pharo-project] [update 2.0] #20443

[Marcus Denker]

20443
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Issue 7147:     CleanUp lowlevel dispalyObject anymation methods a little
        http://code.google.com/p/pharo/issues/detail?id=7147
        
Issue 7140:     LayoutFrame refactoring
        http://code.google.com/p/pharo/issues/detail?id=7140
        
Issue 7133:     Nautilus Cannot rename class in latest image
        http://code.google.com/p/pharo/issues/detail?id=7133
        
Issue 7146:     remove FileStream>#dateIsValid
        http://code.google.com/p/pharo/issues/detail?id=7146
        
Issue 5475:     flat padded date formats
        http://code.google.com/p/pharo/issues/detail?id=5475


Diff information:
http://ss3.gemstone.com/ss/Pharo20/NautilusRefactoring-MarcusDenker.61.diff
http://ss3.gemstone.com/ss/Pharo20/Morphic-MarcusDenker.1308.diff
http://ss3.gemstone.com/ss/Pharo20/KernelTests-MarcusDenker.461.diff
http://ss3.gemstone.com/ss/Pharo20/Graphics-Display 
Objects-MarcusDenker.100.diff
http://ss3.gemstone.com/ss/Pharo20/Files-MarcusDenker.ducasse.287.diff