pgsql: Update time zone data files to tzdata release 2016a.

Update time zone data files to tzdata release 2016a.

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

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a73311e5256b57a59677083e71b5bf93e583cc05

Modified Files
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src/timezone/data/asia | 24 ++++++++++++++---
src/timezone/data/backward | 1 +
src/timezone/data/backzone | 7 ++++-
src/timezone/data/europe | 15 ++++++++++-
src/timezone/data/northamerica | 58 ++++++++++++++++++++----------------------
src/timezone/data/zone.tab | 5 ++--
src/timezone/data/zone1970.tab | 8 +++---
7 files changed, 73 insertions(+), 45 deletions(-)

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