[Pharo-project] [update 2.0] #20134

[Stéphane Ducasse]

20134
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- Issue 5750:   RPackage should rename extension methods in pckage renames. 
Thanks Mariano Martinez-Peck and Guillermo Polito.
        http://code.google.com/p/pharo/issues/detail?id=5750
        
-  Issue 6073:  Make PragmaCollector rely on SystemAnnouncer instead of 
SystemChangeNotifier. Thanks Mariano Martinez-Peck and Guillermo Polito.
        http://code.google.com/p/pharo/issues/detail?id=6073