[update 2.0] #20247

20247
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Issue 6493: Integrate new version of Fuel and remove obsolete packages
        http://code.google.com/p/pharo/issues/detail?id=6493
       
Issue 6517: recategorizing some methods in PollyMoprh
        http://code.google.com/p/pharo/issues/detail?id=6517
       
Issue 6519: Merge NE and NO Completion
        http://code.google.com/p/pharo/issues/detail?id=6519
       
Issue 6534: Morphic+Polymorph changes
        http://code.google.com/p/pharo/issues/detail?id=6534

Issue 6536: add convenience BlockClosure>>#valueWithoutNotification
        http://code.google.com/p/pharo/issues/detail?id=6536
       
Issue 6537: gofer tests is using #doSilently:
        http://code.google.com/p/pharo/issues/detail?id=6537