pgsql: Allow pl/pythonu >= version 2.3 to return boolean, rather than

Log Message:
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Allow pl/pythonu >= version 2.3 to return boolean, rather than 1/0.

Marko Kreen

Modified Files:
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pgsql/src/pl/plpython:
plpython.c (r1.98 -> r1.99)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/plpython.c.diff?r1=1.98&r2=1.99)