bug#44895: Add Info-copy-permalink

[Jean Louis]

* Stefan Kangas <stefan@marxist.se> [2020-11-27 13:46]:
> Drew Adams <drew.adams@oracle.com> writes:
> 
> > If you use Info+ then `G' (`Info-goto-node-web')
> > takes you to the Web version of the current node.
> >
> > It uses function `Info-url-for-node' (also from
> > Info+) to get the URL for that.
> 
> I think this looks useful for Emacs itself.  A rough attempt at doing
> so attached.

What Drew said and provided should be built-in into Emacs, and if not
for all info files, at least for Emacs based info files.

Myself I would even like collecting hyperlinks into a ring to be able
to easier give them as reference several of them at once with title
and URL, not just URL.