[Pharo-project] [update 2.0] #20279

[Esteban Lorenzano]

20279
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Issue 6654:     Make one RPackage maps one PackageInfo
        http://code.google.com/p/pharo/issues/detail?id=6654
        
(pass 1)

- Rollback Nautilus to a pre-tags version
- initialize RPackageOrganizer from PackageInfos as before

WARNING: This does not restores 2.0 stability, but it makes it a bit more 
usable... I'm working on the other issues.