pgstatsinfo - pg_statsinfo: Cleanup logging codes and add documentation.

Log Message:
-----------
Cleanup logging codes and add documentation.
- Add English documentation.
- Split warm-standby and internal module documentation.
- Change the default for pg_statsinfo.syslog_line_prefix to 't %p '.
- Support non-default log_error_verbosity.
- Support local, GMT and UTC for log_timezone, but we cannot support others
because postgres uses own timezone implemntation.
- Simplify codes for log_line_prefix.

Modified Files:
--------------
pg_statsinfo/bin:
collector.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector.c?r1=1.12&r2=1.13)
logger.c (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger.c?r1=1.14&r2=1.15)
logger_out.c (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger_out.c?r1=1.5&r2=1.6)
pg_statsinfo.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.c?r1=1.12&r2=1.13)
pg_statsinfo.h (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.h?r1=1.12&r2=1.13)
pg_statsinfo/bin/pgut:
pgut.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pgut/pgut.c?r1=1.10&r2=1.11)
pg_statsinfo/doc:
pg_statsinfo-ja.html (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/pg_statsinfo-ja.html?r1=1.2&r2=1.3)
pg_statsinfo/lib:
libstatsinfo.c (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/libstatsinfo.c?r1=1.13&r2=1.14)

Added Files:
-----------
pg_statsinfo/doc:
pg_statsinfo-internal-ja.html (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/pg_statsinfo-internal-ja.html?rev=1.1&content-type=text/x-cvsweb-markup)
pg_statsinfo-warm-standby-ja.html (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/pg_statsinfo-warm-standby-ja.html?rev=1.1&content-type=text/x-cvsweb-markup)
pg_statsinfo.html (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/pg_statsinfo.html?rev=1.1&content-type=text/x-cvsweb-markup)
pg_statsinfo/doc/image:
daemon.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/daemon.png?rev=1.1&content-type=text/x-cvsweb-markup)
pg_statsinfo-ja.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/pg_statsinfo-ja.png?rev=1.1&content-type=text/x-cvsweb-markup)
warm-standby-failover-ja.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/warm-standby-failover-ja.png?rev=1.1&content-type=text/x-cvsweb-markup)
warm-standby-failover.2-ja.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/warm-standby-failover.2-ja.png?rev=1.1&content-type=text/x-cvsweb-markup)
warm-standby-ja.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/warm-standby-ja.png?rev=1.1&content-type=text/x-cvsweb-markup)
warm-standby.2-ja.png (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/image/warm-standby.2-ja.png?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
-------------
pg_statsinfo/doc:
daemon-ja.png
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/daemon-ja.png)
pg_statsinfo-ja.png
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/pg_statsinfo-ja.png)
warm-standby-failover-ja.png
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/warm-standby-failover-ja.png)
warm-standby-ja.png
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/doc/warm-standby-ja.png)