When closing an issue, all related issues marked as duplicates are now also closed. git-svn-id: http://redmine.rubyforge.org/svn/trunk@663 e93f8b46-1217-0410-a6f0-8f06a7374b81
git-svn-id: http://redmine.rubyforge.org/svn/trunk@577 e93f8b46-1217-0410-a6f0-8f06a7374b81