[update 2.0] #20538

20538
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Issue 7487: Testrunner calls #pragmas a class not implementing it
        http://code.google.com/p/pharo/issues/detail?id=7487
       
Issue 7341: Failing test: ReleaseTest>>#testInstalledMethodsWithIncorrectTrailerKind
        http://code.google.com/p/pharo/issues/detail?id=7341
       
Issue 7485: Make SmalltalkImage>>#downloadSources behavior an optional setting and default to false
        http://code.google.com/p/pharo/issues/detail?id=7485


Diff information:
http://ss3.gemstone.com/ss/Pharo20/Tests-MarcusDenker.506.diff
http://ss3.gemstone.com/ss/Pharo20/System-Support-MarcusDenker.782.diff
http://ss3.gemstone.com/ss/Pharo20/Settings-System-MarcusDenker.23.diff