Adding fulldisjunctions to the contrib

Hi,
I wish to add the fulldisjunctions function to the contrib.
With the help of Jonah, we (or rather he :) created a patch with
regression tests. The function is finished programmatically but
still a little more code documentation touches and improved error messages
are needed. All the rest was extensively tested.

Attached is the patch.

Works great. Just compiled from a fresh cvs which i patched with the
attached diff. ran the fulldijsjunction.sql in the
share/contrib/fulldisjunction and let it run and it works great.
10x.

--
Regards,
        Tzahi.
--
Tzahi Fadida
Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info
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