add support form multiple DBs
add support form multiple DBs

DB constructor now accepts a modifier that allows it to use an alternate configuration.

barspi/jPOS-EE,barspi/jPOS-EE,jrfinc/jPOS-EE,jpos/jPOS-EE,barspi/jPOS-EE,jrfinc/jPOS-EE,jpos/jPOS-EE,jrfinc/jPOS-EE,jpos/jPOS-EE