Support for PostgreSQL

Support for PostgreSQL

PostgreSQL is now supported. There are some issues with commit/rollback after exception and blobs.

The Java databases QED and Mckoi have been tested as well, unfortunately there are still bigger problems with these two.

Bugfixes:
- identifiers where not correctly converted to uppercase before being quoted
- autoincrement column was not correctly converted to uppercase

A simple Object-Relation mapping library is included in this release. It is not finished, so this is just a preview. Maybe a new sourceforge project will be started later. The targets of the project are:

- Very easy to use and learn.
- Small and fast library.
- Practical and simple API.
- Based on standards: uses SQL as the query language.
- No need to write boilerplate code.
- No need to write any exception handling code (if you don't want).
- No need to hand-write any XML.
- No need to maintain Javadoc tags and use a special build process.
- Can be combined with JDBC / SQL code if required.

The code and the javadocs are in the package org.ldbc.or.