pgsql: Minor improvements in backup and recovery: - create a separate

Log Message:
-----------
Minor improvements in backup and recovery:

- create a separate archive_mode GUC, on which archive_command is dependent

- %r option in recovery.conf sends last restartpoint to recovery command

- %r used in pg_standby, updated README

- minor other code cleanup in pg_standby

- doc on Warm Standby now mentions pg_standby and %r

- log_restartpoints recovery option emits LOG message at each restartpoint

- end of recovery now displays last transaction end time, as requested
  by Warren Little; also shown at each restartpoint

- restart archiver if needed to carry away WAL files at shutdown

Simon Riggs

Modified Files:
--------------
    pgsql/contrib/pg_standby:
        README.pg_standby (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_standby/README.pg_standby?r1=1.1&r2=1.2)
        pg_standby.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_standby/pg_standby.c?r1=1.8&r2=1.9)
    pgsql/doc/src/sgml:
        backup.sgml (r2.101 -> r2.102)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml?r1=2.101&r2=2.102)
        config.sgml (r1.147 -> r1.148)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.147&r2=1.148)
        perform.sgml (r1.64 -> r1.65)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/perform.sgml?r1=1.64&r2=1.65)
    pgsql/doc/src/sgml/ref:
        show.sgml (r1.43 -> r1.44)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/show.sgml?r1=1.43&r2=1.44)
    pgsql/src/backend/access/transam:
        xlog.c (r1.281 -> r1.282)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.281&r2=1.282)
    pgsql/src/backend/postmaster:
        pgarch.c (r1.30 -> r1.31)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgarch.c?r1=1.30&r2=1.31)
        postmaster.c (r1.541 -> r1.542)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.541&r2=1.542)
    pgsql/src/backend/utils/misc:
        guc.c (r1.422 -> r1.423)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c?r1=1.422&r2=1.423)
        postgresql.conf.sample (r1.230 -> r1.231)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample?r1=1.230&r2=1.231)
    pgsql/src/include/access:
        xlog.h (r1.83 -> r1.84)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/xlog.h?r1=1.83&r2=1.84)