pgsql: This patch against 8.0.0beta1 source adds log_line_prefix options

Log Message:
-----------
This patch against 8.0.0beta1 source adds log_line_prefix options for
millisecond timestamps (%m) and remote host (%h). The milliseconds are
useful for QPS measurements.

Ed L.

Modified Files:
--------------
pgsql/doc/src/sgml:
runtime.sgml (r1.322 -> r1.323)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml.diff?r1=1.322&r2=1.323)
pgsql/src/backend/utils/error:
elog.c (r1.158 -> r1.159)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/error/elog.c.diff?r1=1.158&r2=1.159)
pgsql/src/backend/utils/misc:
postgresql.conf.sample (r1.143 -> r1.144)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample.diff?r1=1.143&r2=1.144)