20317
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Issue 6167: ClassFactoryForTestCase has silent extensions from fuel
http://code.google.com/p/pharo/issues/detail?id=6167
Issue 6392: DNU for Text initialize
http://code.google.com/p/pharo/issues/detail?id=6392
Issue 6277: PharoV10.sources files should be loaded on demand
http://code.google.com/p/pharo/issues/detail?id=6277-- Marcus Denker -- http://marcusdenker.de
