USR_KIL

Purpose:        Kills a user session

Input Syntax:   USR_KIL <pid> [<signal>]

Input Params:   pid    INT = process id (=session number)
                signal INT = signal number for kill

Output Syntax:  [+|-]<message>

Output Params:  message    CHAR(128) = human-readable message

Right required: R_USER_KICK

Implementation: f4adp_user.c / f4adp_usr_kil()
