[tz] tzdata for 2016 leap seconds

[Paul Eggert]

Howard Hinnant wrote:
> Here is working code for me:

Sure, but that uses library code for parsing the tz database source, whereas I 
was asking about end-user applications that need months-in-advance notice of 
leap seconds. As Bradley writes, most of the world that cares about leap seconds 
uses NTP and does not depend on tz-derived leap seconds information.

Changing the subject slightly, ICANN is not able to provide leap second data to 
billions of clients directly, as we don't have the capacity. For example, 
widely-used client code should not poll ietf.org or iana.org (or github.com!) to 
grab the "latest" leap second data. I'm sure you know this; I'm just stating the 
obvious for readers who may not be aware of the practical limitations.