MSG_SET

Purpose:        Set a message

Input Syntax:   MSG_SET {d|g:<groupname>|u:<username>} <name> <length>

Input Params:   d|g|u     CHAR(1)  = get default, group or user messages
                groupname CHAR(16) = group name
                username  CHAR(16) = user name
                name      CHAR(32) = message name
                length    INT32    = message length

Output Syntax:  +Ok

Output Params:  none

Right required: R_MESSAGES

Implementation: f4adp_message.c / f4adp_msg_set()

Remarks:        After ftpd confirmed the command with the +Ok reply, the
                client must send the message.
