[commit 1/3] Import gnulib's update-copyright script

[Joel Brobecker]

> I don't see how that scripts would have prevented the selective
> check-in.  :-)

Perhaps not, but what I would have done was doing an update first,
check that in, and then add the new module. WDYT?

> It may help by keeping the git version in some script variable, that
> the script checks, instead of having to fetch the version from the
> ChangeLog?  The new gnulib/ parent directory seems like a good place
> for this stuff.

Sure. Since there does not appear to be gnulib releases, I was
under the impression that we'd always go with the current head,
somehow. Having the hash in the script is a good idea, makes
things completely reproduceable...

-- 
Joel