pgsql: Ooops, I was too busy worrying about getting the transactional

Log Message:
-----------
Ooops, I was too busy worrying about getting the transactional infrastructure
right to think carefully about how insert and delete counts map to
n_live_tuples. Of course a deletion should reduce n_live_tuples.

Modified Files:
--------------
pgsql/src/backend/postmaster:
pgstat.c (r1.157 -> r1.158)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgstat.c.diff?r1=1.157&r2=1.158)
pgsql/src/include:
pgstat.h (r1.60 -> r1.61)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pgstat.h.diff?r1=1.60&r2=1.61)