[tz] Add option to act like global-tz

[Stephen Colebourne]

On Wed, 17 Aug 2022 at 14:06, Robert Elz via tz <tz at iana.org> wrote:
>   | Robert, if there is something specific about global-tz that is "wrong"
>
> I would have preferred if the comments from backzone moved back to the
> original files, along with the data - the way it was done for 2022agtz
> but it worked as it was, in general.

Feel free to raise it here. In summary though, comments would be a lot
of effort for minimal reward IMO:
https://github.com/JodaOrg/global-tz/issues

(2022cgtz is now available)

thanks
Stephen