* priority, start/due dates, progress, estimate, spent time roll-up to parent issues
* descendant issues tree displayed on the issue view with context menu support
* issue tree display on the gantt chart
* issue tree copy on project copy
* unlimited nesting

Defining subtasks requires the new permission 'Manage subtasks'.
Subtasks can not belong to a different project than the parent task.

Implementation is based on scoped nested sets for fast reads and updates.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3573 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3572 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3571 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3570 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3569 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3568 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3567 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3566 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3565 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3564 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3563 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3562 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3561 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3560 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3559 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3558 e93f8b46-1217-0410-a6f0-8f06a7374b81

* 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).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3555 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3554 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3553 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3552 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3551 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3550 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3549 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3548 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3547 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3546 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3545 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3544 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3543 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3542 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3541 e93f8b46-1217-0410-a6f0-8f06a7374b81

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

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3540 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3539 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3538 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3537 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3536 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3535 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3534 e93f8b46-1217-0410-a6f0-8f06a7374b81