Added the ability to copy a project in the Project Administration panel.

* Added Copy project button.
* Added Project#copy_from to duplicate a project to be modified and saved by the user
* Added a ProjectsController#copy based off the add method
** Used Project#copy_from to create a duplicate project in memory
* Implemented Project#copy to copy data for a project from another and save it.
** Members
** Project level queries
** Project custom fields
* Added a plugin hook for Project#copy.

  #1125  #1556  #886  #309

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2704 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/issues.yml

@@ -58,7 +58,7 @@ issues_004:
   category_id: 
   description: Issue on project 2
   tracker_id: 1
-  assigned_to_id: 
+  assigned_to_id: 2
   author_id: 2
   status_id: 1
 issues_005: 
@@ -125,4 +125,4 @@ issues_008:
   start_date: 
   due_date: 
   lock_version: 0
-  
+