* Adds watched_by class method in ActsAsWatchable
* Adds Issue#recently_updated, Issue#with_limit and Issue#on_active_project

  #2482

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3557 e93f8b46-1217-0410-a6f0-8f06a7374b81

* ja (#4946)
* zh-TW (#4947)
* ru



git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3556 e93f8b46-1217-0410-a6f0-8f06a7374b81

Fixed: NoMethodError error on roadmap if no trackers are selected and a shared version is available (#5006).

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This removes an instance variable in #issue_update which will let it be moved
to the Issue model.

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Attachment#attach_files will no longer need to return a flash message,
instead it will put unsaved attachments into object#unsaved_attachments
where the calling object can access them.

A utility method #render_attachment_warning_if_needed is included for setting
the standard flash warning.

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