Persistence unified

Unified persistence for Eiffel

This project is about developing a single, integrated and simple persistence framework for Eiffel. It should be single because nothing else should be needed to access any kind of persistence services. It should be integrated because aims at integrating both the already existing technologies and frameworks, as far as they deliver the intended benefits, and possibly new ones. It should be simple because it should be very easy to use, removing all the unnecessary complexity.