Update to 2016c

The 2016c release of the tz code and data is available. Its most urgent
change is for Asia/Baku, where the update takes effect this weekend.

This release reflects the following changes, which were either
circulated on the tz mailing list or are relatively minor technical or
administrative changes:

   Changes affecting future time stamps

     Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)

     Chile reverts from permanent to seasonal DST. (Thanks to Juan
     Correa for the heads-up, and to Tim Parenti for corrections.)
     Guess that future transitions are August's and May's second
     Saturdays at 24:00 mainland time. Also, call the period from
     2014-09-07 through 2016-05-14 daylight saving time instead of
     standard time, as that seems more appropriate now.

   Changes affecting past time stamps

     Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
     +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
     from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
     (Thanks to Stepan Golosunov.)

   Changes to commentary

     Several updates and URLs for historical and proposed Russian changes.
     (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)