pgsql: Add: > * Make log_min_duration_statement output when the

Log Message:
-----------
Add:

* Make log_min_duration_statement output when the duration is reached rather
than when the statement completes

This prints long queries while they are running, making trouble shooting
easier. Also, it eliminates the need for log_statement because it
would now be the same as a log_min_duration_statement of zero.

Modified Files:
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pgsql/doc:
TODO (r1.1408 -> r1.1409)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1408&r2=1.1409)