pgsql: Update the tznames reference files, and add IDT (Israel Daylight

Log Message:
-----------
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

Tags:
----
REL8_2_STABLE

Modified Files:
--------------
    pgsql/src/timezone/tznames:
        Africa.txt (r1.2 -> r1.2.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Africa.txt?r1=1.2&r2=1.2.2.1)
        America.txt (r1.2.2.2 -> r1.2.2.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/America.txt?r1=1.2.2.2&r2=1.2.2.3)
        Asia.txt (r1.2.2.1 -> r1.2.2.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Asia.txt?r1=1.2.2.1&r2=1.2.2.2)
        Australia.txt (r1.2 -> r1.2.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Australia.txt?r1=1.2&r2=1.2.2.1)
        Default (r1.2.2.4 -> r1.2.2.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Default?r1=1.2.2.4&r2=1.2.2.5)
        Europe.txt (r1.2 -> r1.2.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Europe.txt?r1=1.2&r2=1.2.2.1)
        Indian.txt (r1.2.2.1 -> r1.2.2.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Indian.txt?r1=1.2.2.1&r2=1.2.2.2)
        README (r1.2 -> r1.2.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/README?r1=1.2&r2=1.2.2.1)