DST law changes in Kemerovo and Novosibirsk.  Historical corrections for
Azerbaijan, Belarus, and Morocco.  Asia/Novokuznetsk and Asia/Novosibirsk
now use numeric time zone abbreviations instead of invented ones.  Zones
for Antarctic bases and other locations that have been uninhabited for
portions of the time span known to the tzdata database now report "-00"
rather than "zzz" as the zone abbreviation for those time spans.

Also, I decided to remove some of the timezone/data/ files that we don't
use.  At one time that subdirectory was a complete copy of what IANA
distributes in the tzdata tarballs, but that hasn't been true for a long
time.  There seems no good reason to keep shipping those specific files
but not others; they're just bloating our tarballs.

DST law changes in Russia (Magadan, Tomsk regions) and Venezuela.
Historical corrections for Russia.  There are new zone names Europe/Kirov
and Asia/Tomsk reflecting the fact that these regions now have different
time zone histories from adjacent regions.

DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia (Altai,
Astrakhan, Kirov, Sakhalin, Ulyanovsk regions).  Historical corrections
for Lithuania, Moldova, Russia (Kaliningrad, Samara, Volgograd).

As of 2015b, the keepers of the IANA timezone database started to use
numeric time zone abbreviations (e.g., "+04") instead of inventing
abbreviations not found in the wild like "ASTT".  This causes our rather
old copy of zic to whine "warning: time zone abbreviation differs from
POSIX standard" several times during "make install".  This warning is
harmless according to the IANA folk, and I don't see any problems with
these abbreviations in some simple tests; but it seems like now would be
a good time to update our copy of the tzcode stuff.  I'll look into that
soon.

DST law changes in Cayman Islands, Metlakatla, Trans-Baikal Territory
(Zabaykalsky Krai).  Historical corrections for Pakistan.

DST law changes in Cayman Islands, Fiji, Moldova, Morocco, Norfolk Island,
North Korea, Turkey, Uruguay.  New zone America/Fort_Nelson for Canadian
Northern Rockies.

DST law changes in Chile and Mexico (state of Quintana Roo).
Historical changes for Iceland.

DST law changes in the Turks & Caicos Islands (America/Grand_Turk) and
in Fiji.  New zone Pacific/Bougainville for portions of Papua New Guinea.
Historical changes for Korea and Vietnam.

Most zones in the Russian Federation are subtracting one or two hours
as of 2014-10-26.  Update the meanings of the abbreviations IRKT, KRAT,
MAGT, MSK, NOVT, OMST, SAKT, VLAT, YAKT, YEKT to match.

The IANA timezone database has adopted abbreviations of the form AxST/AxDT
for all Australian time zones, reflecting what they believe to be current
majority practice Down Under.  These names do not conflict with usage
elsewhere (other than ACST for Acre Summer Time, which has been in disuse
since 1994).  Accordingly, adopt these names into our "Default" timezone
abbreviation set.  The "Australia" abbreviation set now contains only
CST,EAST,EST,SAST,SAT,WST, all of which are thought to be mostly historical
usage.  Note that SAST has also been changed to be South Africa Standard
Time in the "Default" abbreviation set.

Add zone abbreviations SRET (Asia/Srednekolymsk) and XJT (Asia/Urumqi),
and use WSST/WSDT for western Samoa.

Also a DST law change in the Turks & Caicos Islands (America/Grand_Turk),
and numerous corrections for historical time zone data.

DST law changes in Crimea, Egypt, Morocco.  New zone Antarctica/Troll
for Norwegian base in Queen Maud Land.

DST law changes in Argentina, Brazil, Jordan, Libya, Liechtenstein,
Morocco, Palestine.  New timezone abbreviations WIB, WIT, WITA for
Indonesia.