Change user list to non-ambiguous

Check user lists (user suggestor on new permission).
Make change proposal so that user is never ambiguous:

• should display enough fields so that we make sure it is unique

Check if there are other places user is shown (ie nuxeo-user-tag)

Make sure we can read full name last name email and user id everywhere a reference to user is displayed.

note
Should result in an elements ticket with improvement.