Postgres for openmolar2

I've been playing with postgres all morning, and have decided that the next version of openmolar will use it in preference to MySQL.

Main Reasons.

1. it's a clean break with the past
2. GNUmed use postgres
3. active development
4. standards compliance
5. not owned by oracle

A huge thankyou to all postgres devs for a wonderful open-source back-end.