[Pharo-project] [update 2.0] #20478

[Marcus Denker]

20478
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Issue 7280:     When changing the superclasss the class comment and all method 
categories of all subclasses are gone
        http://code.google.com/p/pharo/issues/detail?id=7280
        
Issue 6686:     Nautilus should use Dropdown, Tabs or Checkbox to indicate 
Class/instance-side
        http://code.google.com/p/pharo/issues/detail?id=6686



Diff information:
http://ss3.gemstone.com/ss/Pharo20/Polymorph-Widgets-MarcusDenker.753.diff
http://ss3.gemstone.com/ss/Pharo20/NautilusCommon-MarcusDenker.107.diff
http://ss3.gemstone.com/ss/Pharo20/Nautilus-MarcusDenker.396.diff
http://ss3.gemstone.com/ss/Pharo20/Kernel-MarcusDenker.1286.diff