MSG_AVL

Purpose:        Get available messages for group or user or default

Input Syntax:   MSG_AVL {d|g:<groupname>|u:<username>}

Input Params:   d|g:|u:   CHAR(2)  = get default, group or user messages
                groupname CHAR(16) = group name
                username  CHAR(16) = user name

Output Syntax:  +<messages>

Output Params:  messages CHAR(512) = message names, separated by SPACE

Right required: R_MESSAGES

Implementation: f4adp_message.c / f4adp_msg_avl()

Remarks:        Available messages means messages present on the server,
                either for a user or group, or a default message.
                The message mue be present, this means there is a message
                file.
