pgsql-server: Add: > * Merge hardwired timezone names with the TZ

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

* Merge hardwired timezone names with the TZ database; allow either kind
everywhere a TZ name is currently taken
* Allow customization of the known set of TZ names (generalize the
present australian_timezones hack)

Modified Files:
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pgsql-server/doc:
TODO (r1.1343 -> r1.1344)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/TODO.diff?r1=1.1343&r2=1.1344)