Added the ability to archive projects:

* Only administrators can archive/unarchive projects.
* Once archived, the project is visible on the admin project listing only. It doesn't show up anywhere else in the app. Subprojects are also archived.
* Archive/unarchive preserve everything on the project (issues, members, ...).
* A subproject can not be unarchived if its parent project is archived.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@549 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/users_controller.rb

@@ -88,7 +88,7 @@ class UsersController < ApplicationController
     end
     @auth_sources = AuthSource.find(:all)
     @roles = Role.find(:all, :order => 'position')
-    @projects = Project.find(:all) - @user.projects
+    @projects = Project.find(:all, :order => 'name', :conditions => "status=#{Project::STATUS_ACTIVE}") - @user.projects
     @membership ||= Member.new
   end