* Add support NULL to GiST.

Teodor Sigaev <teodor@sigaev.ru>

Commit: d2158b02813bb44116988eeb10d9a32565b58c1c
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2006-05-24T11:01:39Z
Releases: 8.2.0
* Add support NULL to GiST.
* some refactoring and simplify code int gistutil.c and gist.c
* now in some cases it can be called used-defined
  picksplit method for non-first column in index, but here
	is a place to do more.
* small fix of docs related to support NULL.

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