pgsql: Add GUC update_process_title to control whether 'ps' display is

Log Message:
-----------
Add GUC update_process_title to control whether 'ps' display is updated
for every command, default to on.

Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.67 -> r1.68)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml.diff?r1=1.67&r2=1.68)
pgsql/src/backend/bootstrap:
bootstrap.c (r1.217 -> r1.218)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/bootstrap/bootstrap.c.diff?r1=1.217&r2=1.218)
pgsql/src/backend/commands:
async.c (r1.131 -> r1.132)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/async.c.diff?r1=1.131&r2=1.132)
pgsql/src/backend/postmaster:
autovacuum.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c.diff?r1=1.20&r2=1.21)
pgarch.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgarch.c.diff?r1=1.23&r2=1.24)
pgstat.c (r1.131 -> r1.132)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgstat.c.diff?r1=1.131&r2=1.132)
postmaster.c (r1.488 -> r1.489)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.488&r2=1.489)
syslogger.c (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/syslogger.c.diff?r1=1.25&r2=1.26)
pgsql/src/backend/storage/lmgr:
lock.c (r1.164 -> r1.165)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lock.c.diff?r1=1.164&r2=1.165)
pgsql/src/backend/tcop:
postgres.c (r1.489 -> r1.490)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c.diff?r1=1.489&r2=1.490)
pgsql/src/backend/utils/misc:
guc.c (r1.323 -> r1.324)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c.diff?r1=1.323&r2=1.324)
postgresql.conf.sample (r1.181 -> r1.182)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample.diff?r1=1.181&r2=1.182)
ps_status.c (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c.diff?r1=1.30&r2=1.31)
pgsql/src/include/utils:
ps_status.h (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/ps_status.h.diff?r1=1.26&r2=1.27)