Quieten the user 0 message to the Aide room.

Quieten the user 0 message to the Aide room.
User 0 is created as a side effect of the system posting messages from
the masterCC. This side effect has the benefit of recording the number
of messages the system has generated.
Should we make use of this somewhere?
The actual code that creates the user 0 is in CtdlSubmitMsg() and reads
as
        /* Bump this user's messages posted counter. */
        CtdlLogPrintf(CTDL_DEBUG, "Updating user\n");
        lgetuser(&CCC->user, CCC->curr_user);
        CCC->user.posted = CCC->user.posted + 1;
        lputuser(&CCC->user);

Its around msgbase.c:2624