Default configuration data can now be loaded from the administration screen.
A message is automatically displayed on this screen if roles, trackers,... have not been configured yet. The rake task is still available and the data loading code is wrapped in a transaction. git-svn-id: https://svn.redmine.org/redmine/trunk@1040 e93f8b46-1217-0410-a6f0-8f06a7374b81
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