[Pharo-project] [update 3.0] #30029

[Marcus Denker]

30029
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10173 ClassBuilder cannot safely modify a class why using it
        https://pharo.fogbugz.com/f/cases/10173/

10130 isNil and ... notNil
        https://pharo.fogbugz.com/f/cases/10130
        
10248 Remove old Pharo20 repository in Pharo30
        https://pharo.fogbugz.com/f/cases/10248


Diff information:
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/Kernel-MarcusDenker.1356