UAN

Purpose:        Checks if registered or anonymous user wants to log in, and if
                ident is required

Input Syntax:   UAN <username>

Input Params:   <username>  CHAR(10)  = username

Output Syntax:  [+|-][a|n][i|n]

Output Params:  + = login permitted
                - = too many users
                a = anonymous login, ask for e-mail address
                n = normal login, ask for password
                i = check for ident
                n = do not check ident

Right required: none

Implementation: serverd.c / user_anonymous()
