[Pharo-project] [update 2.0] #20441

[Stéphane Ducasse]

20441
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Issue 7028:     #cleanUpForRelease breaks ChangeSorter
        In fact ChangeSet cleanUp: true puts the system on its knees with 
        a nice endless loop due to moribond record.
        http://code.google.com/p/pharo/issues/detail?id=7028
Diff information:
http://ss3.gemstone.com/ss/Pharo20/System-Changes-StephaneDucasse.193.diff