[Pharo-dev] [update 3.0] #30216

[Marcus Denker]

30216
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10995 remove #printWithClosureAnalysisOn:
        https://pharo.fogbugz.com/f/cases/10995
        
10985 StepList full of useless morphs
        https://pharo.fogbugz.com/f/cases/10985
        
10892 flatCollect added to pharo
        https://pharo.fogbugz.com/f/cases/10892

Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Traits-MarcusDenker.516.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Morphic-Base-MarcusDenker.17.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Kernel-MarcusDenker.1493.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Compiler-MarcusDenker.491.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Collections-Abstract-MarcusDenker.210.diff