[Pharo-dev] [update 3.0] #30260

[Marcus Denker]

30260
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11150 Reshaping a class does not properly propagate the modification to the 
subclasses of its subclasses
        https://pharo.fogbugz.com/f/cases/11150
        
Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Slot-MarcusDenker.344.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/SlotTests-MarcusDenker.41.diff