Add pg_describe_object function

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 6cc2deb86e9183262493a6537700ee305fb3e096
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2010-11-18T20:06:19Z
Releases: 9.1.0
Add pg_describe_object function

This function is useful to obtain textual descriptions of objects as
stored in pg_depend.

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