bug#18133: Suppressing asynchronous command output

[Eli Zaretskii]

> From: Reuben Thomas <rrt@sc3d.org>
> Date: Fri, 30 Dec 2016 18:28:46 +0000
> Cc: Eli Zaretskii <eliz@gnu.org>, martin rudalics <rudalics@gmx.at>, 
> 18133@debbugs.gnu.org
> 
> It would be good if you experts could agree on an approach that I could 
> quickly implement. I'm out of my depth
> here as far as design goes, and while I'm learning a bit, I'm not sure it's a 
> good use of the total amount of time
> we seem to be expending between us!

I'm okay with your last variant, if you change
comint-make-newly-written-buffer-visible to make the list of buffer
names customizable.

Thanks.