Showing full name along with username in requests

Until now username (eppn) was shown in requests. This gives very few
information if eppn is composed as `number@domain'. However, full name
isn't helpful for common names (i.e. John Smith) either. That's why
we've choosen to show `Full Name (username)'.
Fixing previous commit

For requests made by anonymous like creating a new user, requester was
incorrectly displayed.
Merge pull request #139 from JanOppolzer/queue

Show requester's full name and username in requests