Обсуждение: pgsql-server: Apply patch from Steven Singer for contrib/dbmirror.

Log Message:
-----------
Apply patch from Steven Singer for contrib/dbmirror. Changes:

-It fixes up some bugs with handling setval calls
-Adds upgrade instructions from prior versions
-Improved the sample config file
-Fixed some things in the clean_pending script

Modified Files:
--------------
    pgsql-server/contrib/dbmirror:
        MirrorSetup.sql (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/dbmirror/MirrorSetup.sql.diff?r1=1.6&r2=1.7)
        README.dbmirror (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/dbmirror/README.dbmirror.diff?r1=1.8&r2=1.9)
        clean_pending.pl (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/dbmirror/clean_pending.pl.diff?r1=1.4&r2=1.5)
        pending.c (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/dbmirror/pending.c.diff?r1=1.19&r2=1.20)
        slaveDatabase.conf (r1.2 -> r1.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/dbmirror/slaveDatabase.conf.diff?r1=1.2&r2=1.3)