Added SET DESCRIPTOR command.

Michael Meskes <meskes@postgresql.org>

Commit: 90326c01c9c116a888998e2744eeca9d3afa6242
Author: Michael Meskes <meskes@postgresql.org>
Date: 2004-06-30T15:01:58Z
Releases: 8.0.0
Added SET DESCRIPTOR command.
	Note that this still has some bugs. The functionality is there though, it's just a matter of fixing the bugs now.
Cleaned up error handling in preprocessor.

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