This represents a Unix User. If initialized via fromEtcPasswdLine(), the users
Name, home, uid, gid, and shell can be asked.
author: marc.eppelmann@reddot.de
Parses a Line from /etc/passwd and stores each :token: in their field of the user.
Sample Line from /etc/passwd "eppelmann.local:x:900:100:Marc Eppelmann:/mnt/local/home/eppelmann.local:/bin/bash"
Parameters: anEtcPasswdLine - A Passwd Line of the User. The filled User