Rename function 'isexists' and 'isdefined' to

Teodor Sigaev <teodor@sigaev.ru>

Commit: 3f16647960ceb471dfacadc5d3a8c87601429256
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2006-10-11T16:42:51Z
Releases: 8.2.0
Rename function 'isexists' and 'isdefined' to
'exist' and 'defined' accordingly. Old names
are saved not mentioned in docs - for compatibility
with old applications.
Per discussion
http://archives.postgresql.org/pgsql-hackers/2006-10/msg00571.php

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