Show requester's full name and username in requests

Usernames are sometimes pointless strings (i.e. 035965@example.org). Full names are better, however, some are quite common such as James Smith. Thus using full name in combination with username/eppn is probably the best solution to identify the requester.

**This pull request should fix the error in J_queue.php library at the line 440 as discussed by mail yesterday.** See lines 440 to 447.

Since I couldn't reproduce the error, I'd appreciate further information if there're still any problems.