Rewrite the Gantt chart. #6276

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

app/helpers/issues_helper.rb

@@ -35,8 +35,10 @@ module IssuesHelper
     @cached_label_due_date ||= l(:field_due_date)
     @cached_label_assigned_to ||= l(:field_assigned_to)
     @cached_label_priority ||= l(:field_priority)
-    
+    @cached_label_project ||= l(:field_project)
+
     link_to_issue(issue) + "<br /><br />" +
+      "<strong>#{@cached_label_project}</strong>: #{link_to_project(issue.project)}<br />" +
       "<strong>#{@cached_label_status}</strong>: #{issue.status.name}<br />" +
       "<strong>#{@cached_label_start_date}</strong>: #{format_date(issue.start_date)}<br />" +
       "<strong>#{@cached_label_due_date}</strong>: #{format_date(issue.due_date)}<br />" +