#18 Add an "admin" flag in user database

[Chad McHenry]

Add an admin flag to users in database, so that
administration can be performed by 'priveledged'
individuals. If there is no database, 'debug' is admin.

If server started from client as a solitaire game,
admin rights should be automatic. See
https://sourceforge.net/tracker/index.php?func=detail&aid=1067513&group_id=103866&atid=636191