Implement dblink_get_notify().

Joe Conway <mail@joeconway.com>

Commit: f4095b4c4b24a6fd2c1c330e572c24c6a9c99ea9
Author: Joe Conway <mail@joeconway.com>
Date: 2009-08-05T16:11:07Z
Releases: 9.0.0
Implement  dblink_get_notify().

Adds the ability to retrieve async notifications using dblink,
via the addition of the function dblink_get_notify(). Original patch
by Marcus Kempe, suggestions by Tom Lane and Alvaro Herrera, patch
review and adjustments by Joe Conway.

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