40423
14644 Make NewVersionBrowser using a RingDefinition instead of class/selector	https://pharo.fogbugz.com/f/cases/1464414648 Include CubeHelix gradient definition	https://pharo.fogbugz.com/f/cases/1464814653 removeing or renaming raises an exception	https://pharo.fogbugz.com/f/cases/14653

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