* Fix: Working around a route issue with
/admin/bookings/status/admin_... CakePHP has issues with parameters
prefixed with "admin_".
* Adding modal textbox to add a message to the automatic email
notification when attendees are unsubscribed.
** Changing CoursesTermsViewModel and /admin/bookings/status action to
handle the customized notification message.
* Creating extension to export courses_views as CSV, infrastructure
there but not properly read by Excel yet.