pgsql: Have log_duration only output when log_statement has printed the

Log Message:
-----------
Have log_duration only output when log_statement has printed the query.
This handles the new multiple log_statement values.

Ed L.

Modified Files:
--------------
pgsql/doc/src/sgml:
runtime.sgml (r1.287 -> r1.288)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml.diff?r1=1.287&r2=1.288)
pgsql/src/backend/tcop:
postgres.c (r1.435 -> r1.436)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c.diff?r1=1.435&r2=1.436)