Re: psql expanded auto

I wrote:
> I have often found myself wanting that psql automatically switch between
> normal and \x mode depending on the width of the output.  Would others
> find this useful?
> 
> Attached is a crude demo patch.  Enable with \pset expanded auto.

Here is a finalized patch for this.  The first hunk of the patch is the
documentation change, so you can see there how it's supposed to work.
Let me know what you think.