pgsql: Add vacuum and analyze counters to pg_stat_*_tables views.

Log Message:
-----------
Add vacuum and analyze counters to pg_stat_*_tables views.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        monitoring.sgml (r1.84 -> r1.85)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/monitoring.sgml?r1=1.84&r2=1.85)
    pgsql/src/backend/catalog:
        system_views.sql (r1.67 -> r1.68)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/system_views.sql?r1=1.67&r2=1.68)
    pgsql/src/backend/postmaster:
        pgstat.c (r1.205 -> r1.206)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgstat.c?r1=1.205&r2=1.206)
    pgsql/src/backend/utils/adt:
        pgstatfuncs.c (r1.61 -> r1.62)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/pgstatfuncs.c?r1=1.61&r2=1.62)
    pgsql/src/include:
        pgstat.h (r1.90 -> r1.91)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pgstat.h?r1=1.90&r2=1.91)
    pgsql/src/include/catalog:
        catversion.h (r1.595 -> r1.596)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h?r1=1.595&r2=1.596)
        pg_proc.h (r1.579 -> r1.580)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h?r1=1.579&r2=1.580)