USR_CHG

Purpose:        Changes a user

Input Syntax:   USR_CHG <name> <var>=<value> [<var>=<value> ...]

Input Params:   name   CHAR(10)  = new username
                var    CHAR(30)  = which data to change
                value  CHAR(30)  = the new value

Output Syntax:  [+|-]<message>

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

Right required: R_USER_EDIT_*

Implementation: f4adp_user.c / f4adp_usr_chg()

Remarks:        The right required to change the user depends on which data is to change.
                This command changes either all data or nothing at all.
