Implement has_sequence_privilege()

Joe Conway <mail@joeconway.com>

Commit: be6bca23b34b6e59f1deed1d6b44bb434dbe890e
Author: Joe Conway <mail@joeconway.com>
Date: 2009-08-03T21:11:40Z
Releases: 9.0.0
Implement has_sequence_privilege()

Add family of functions that did not exist earlier,
mainly due to historical omission. Original patch by
Abhijit Menon-Sen, with review and modifications by
Joe Conway. catversion.h bumped.

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