pgbouncer - pgbouncer: update docs and default config

Log Message:
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update docs and default config

Modified Files:
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pgbouncer:
README (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/README.diff?r1=1.4&r2=1.5)
pgbouncer/doc:
config.txt (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/doc/config.txt.diff?r1=1.18&r2=1.19)
pgbouncer/etc:
pgbouncer.ini (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/etc/pgbouncer.ini.diff?r1=1.8&r2=1.9)