[tz] changes to the TZ database over versions

[Paul Eggert]

Joris Van den Bogaert wrote:
> I didn't find any substantial changes that were made in the near past.

That depends on what you mean by "substantial" and "near", but for 
example 2014a made these changes:

* Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.

* Ukraine switched from Moscow to Eastern European time on 1990-07-01 
(not 1992-01-01), and observed DST during the entire next winter.

* In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.

Unfortunately a significant fraction of the entries in the tz database 
are incorrect.  We do our best to fix errors, though, so please continue 
to expect fixes in the future.