Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL convention

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

Commit: 764f72dc823edb3f8bdf387501ce4c12dedd2369
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-07-17T00:55:37Z
Releases: 7.4.1
Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL convention
for the sign of timezone offsets, ie, positive is east from UTC.  These
were previously out of step with other operations that accept or show
timezones, such as I/O of timestamptz values.

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