[update 2.0] #20527

20527
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Issue 7284: Cannot run gofer load twice => Error: cannot remove non empty category
        http://code.google.com/p/pharo/issues/detail?can=2&q=7284
       
(part 2)

Diff information:
http://ss3.gemstone.com/ss/Pharo20/RPackage-Core-EstebanLorenzano.210.diff
http://ss3.gemstone.com/ss/Pharo20/Monticello-EstebanLorenzano.761.diff