Adds cross-project time reports support (#994).

Files:
modified: /trunk/app/views/timelog/report.rhtml (try)
modified: /trunk/app/helpers/timelog_helper.rb (try)
modified: /trunk/app/models/user.rb (try)
modified: /trunk/test/functional/timelog_controller_test.rb (try)
modified: /trunk/app/views/timelog/details.rhtml (try)
modified: /trunk/config/routes.rb (try)
modified: /trunk/app/controllers/application.rb (try)
modified: /trunk/app/controllers/timelog_controller.rb (try)