Include enabled modules in projects API (#17602).

Contributed by Jan Schulz-Hofen <jan@plan.io>


git-svn-id: http://svn.redmine.org/redmine/trunk@13363 e93f8b46-1217-0410-a6f0-8f06a7374b81
Make 2nd parameter optional in User#allowed_to_globally? for consistency (#6498).


git-svn-id: http://svn.redmine.org/redmine/trunk@13364 e93f8b46-1217-0410-a6f0-8f06a7374b81