time zone data: Update to 2016j

Changes:
     Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
     This hives off a new zone Europe/Saratov from Europe/Volgograd.

     The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
     Asia/Aqtau except it switched from +04/+05 to +05/+06 in spring
     1999, not fall 1994.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>