Support adding remote user to an organization

Support adding existing or new users while on organization page.

(regardless of the source)

This is a regression introduced somewhere along the way in the new storage
API system for osTicket.

Initial concept for user directory

This is the mode of the system if account registration is disabled

Add client registration methods and login required checkbox

The warning was meant to be humorous but apparently the world has no sense
of humor.

Stop propagation on intercept

Credit: http://stackoverflow.com/a/7385673/2867073