This version of the Gantt chart supports nested charts. So Projects,
Versions, and Issues will be nested underneath their parents correctly.

Additional features:

* Move all Gantt code to Redmine::Helpers::Gantt class instead of having it in
  the Gantt class, controller, and view
* Recursive and nest sub-projects
* Recursive and nest versions
* Recursive and nest issues
* Draw a line showing when a Project is active and it's progress
* Draw a line showing when a Version is active and it's progress
* Show a version's % complete
* Change the color of Projects, Versions, and Issues if they are late or
  behind schedule
* Added Project#start_date and #due_date
* Added Project#completed_percent
* Use a mini-gravatar on the Gantt chart
* Added tests for the Gantt rendering

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4072 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4071 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4070 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4069 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4068 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4067 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4066 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4065 e93f8b46-1217-0410-a6f0-8f06a7374b81

Both url paths (/issues/1234) and params hashes (:controller => 'issues')
are now supported by link_to_if_authorized.  The authorize_for method
requires a controller/action pair so urls need to be parsed against the
routes to find their controller/action.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4064 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4063 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4062 e93f8b46-1217-0410-a6f0-8f06a7374b81

Solves #6278


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4061 e93f8b46-1217-0410-a6f0-8f06a7374b81

* ca (#6263)
* nl (#6248)


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4060 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4059 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4058 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4057 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4056 e93f8b46-1217-0410-a6f0-8f06a7374b81

NB: it cannot be done with issues from different projects, same as
other fields. This will be addressed separately, see #5332.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4055 e93f8b46-1217-0410-a6f0-8f06a7374b81

Refactor: move method, ProjectsController#reset_activities to ProjectEnumerationsController#destroy.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4054 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4053 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4052 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4051 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4050 e93f8b46-1217-0410-a6f0-8f06a7374b81

* mk (#6208)
* sv (#6210)


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4049 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4048 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4047 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4046 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4045 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4044 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4043 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4042 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4041 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4040 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4039 e93f8b46-1217-0410-a6f0-8f06a7374b81

* de (#6198)
* ja (#6189)
* zh-TW (#6197)


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4038 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4037 e93f8b46-1217-0410-a6f0-8f06a7374b81

*  project_module_gantt: Gantt
*  project_module_calendar: Calendar


git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4036 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4035 e93f8b46-1217-0410-a6f0-8f06a7374b81

Since #changes is only an Atom feed of journals of a query, it makes
more sense to have it on the JournalsController resource.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4034 e93f8b46-1217-0410-a6f0-8f06a7374b81

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4029 e93f8b46-1217-0410-a6f0-8f06a7374b81