Add the ability to specify number of PostgreSQL clusters and other enhancements.
Add the ability to specify number of PostgreSQL clusters and other enhancements.

Add -n option to specify number of PostgreSQL clusters.  Create
bashrc.ports file which can be sourced by shell variable PGPOOL_PORT
and PCP_PORT.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres