Update the tznames reference files, and add IDT (Israel Daylight Time)

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2b893f65e9359e556f87790c9eb01eab3ea5fc3a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-09-06T15:25:31Z
Releases: 8.4.2
Update the tznames reference files, and add IDT (Israel Daylight Time)
to the Default timezone abbreviation set.

Back-port the the current file set to all branches that contain tznames.
This includes adding SGT to the Default set in pre-8.4 releases.

Joachim Wieland

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