Open 6.3.1 issues

We have several open issues with 6.3.1, which will probably have to be
addressed with a mega-patch, separate patches, or a minor release.

They are:

	indexes not used that were used in 6.2
	memory leak in backend when run on simple queries
	negative sign causing problems in various areas, like float4 & shortint
	configure assert checking is reversed
	UNION crashes on ORDER BY or DISTINCT(already fixed in source tree)

We also have HAVING in the source tree.

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