Traditionally IANA has distributed their timezone data in pure source
form, replete with extensive historical comments.  As of release 2017c,
they've added a compact single-file format that omits comments and
abbreviates command keywords.  This form is way shorter than the pure
source, even before considering its allegedly better compressibility.
Hence, let's distribute the data in that form rather than pure source.

I'm pushing this now, rather than at the next timezone database update,
so that it's easy to confirm that this data file produces compiled zic
output that's identical to what we were getting before.

Discussion: https://postgr.es/m/1915.1511210334@sss.pgh.pa.us

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 Morocco; Tokelau has relocated to the other side of
the International Date Line; and apparently Olson had Tokelau's GMT
offset wrong by an hour even before that.

There are also a large number of non-significant changes in this update.
Upstream took the opportunity to remove trailing whitespace, and the
SCCS-style version numbers on the individual files are gone too.

Bangladesh, Egypt, Jordan, Pakistan.