[update 2.0] #20242

20242
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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 6497: new ReleaseTest >> testUnpackagedClasses
        http://code.google.com/p/pharo/issues/detail?id=6497
       
Issue 6502: FS (FileSystem) and freetype on windows
        http://code.google.com/p/pharo/issues/detail?id=6502
       
Issue 6506: add FileReference>>#isSymlink
        http://code.google.com/p/pharo/issues/detail?id=6506
       
Issue 6507: New Spec version
        http://code.google.com/p/pharo/issues/detail?id=6507