40352
14384 Move DropListItem to Spec-Core-Widgets-Support	https://pharo.fogbugz.com/f/cases/1438414381 Replace Announcer>>#on:send:to:s senders in Versionner-Core-Model	https://pharo.fogbugz.com/f/cases/1438114386 Small critic pass over HelpSystem-Core	https://pharo.fogbugz.com/f/cases/14386

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