[tz] Missing entry for Heard Island and MacDonald Islands

[Paul Eggert]

On 05/11/2012 03:36 PM, Garrett Wollman wrote:
> The historical practice of the maintainers up to this point has been
> that locations that are uninhabited do not get a zone.

Yes, the idea is that the tz database attempts to record
common real-world practice at a location.  Local time is
undefined if there are no locals.  It's like trying to
define the temperature of a true vacuum.

A  goal of the tz database design is to lessen the need
for arguments.  Omitting uninhabited locations is one
small way to further that goal.