The only major ircd supporting /wallchops also supports
/notice @#channel.
The /wall command has used /notice @#channel (if it is
supported which is pretty much everywhere) for a while
and so it can be used without problems on large channels.
git-svn-id: file:///var/www/svn.irssi.org/SVN/irssi/trunk@4902 dbcabf3a-b0e7-0310-adc4-f8d773084564