[IRCServices] need to be on the channel access list to send a memo to the channel

[Andrew Church]

>Anyone who is not on the channel access list can send a memo to any
>channel.
>
>Have an Option where you need to be on the channel access list to send a
>memo to the channel - and not let anyone who is not on the channel
>access list to send a memo to the channel.

Added as the MEMO-RESTRICTED channel option for 5.1pre5.

  --Andrew Church
    achurch at achurch.org
    http://achurch.org/