[update 2.0] #20539

20539
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Issue 7488: Failing test: #testMethodsWithUnboundGlobals
        http://code.google.com/p/pharo/issues/detail?id=7488
       
Issue 7486: Autocompletion fails when superclass is nil. (Generally Traits)
        http://code.google.com/p/pharo/issues/detail?id=7486

Issue 7482: Starting from #20526, cannot remove non-empty category
        http://code.google.com/p/pharo/issues/detail?id=7482
       
Issue 7446: ClassDescription >> correspondingForTest is local
        http://code.google.com/p/pharo/issues/detail?id=7446


Diff information:
http://ss3.gemstone.com/ss/Pharo20/NautilusCommon-MarcusDenker.118.diff
http://ss3.gemstone.com/ss/Pharo20/NECompletion-MarcusDenker.95.diff
http://ss3.gemstone.com/ss/Pharo20/Monticello-MarcusDenker.764.diff