bug#1305: All code that currently beeps should use visual bell instead

[Gregory Heytings]

> > > I have used this for a couple of days and find it strictly better than 
> > > both the default behavior on GNU/Linux with inverse video and flashing 
> > > the minibuffer background.
> >
> > Did you try the patch I sent?
>
> Yes, of course.  I provided detailed comments in a previous post.

You mean, the post to which I replied?  Okay, it wasn't clear to me that 
you were also commenting on that patch.