Bug#513382: Filesystem backend

[LEDUQUE Mickaël]

In fact, in my opinion, the point is to not have the data in ANY big, full
featured, and space hungry database software.
I don't understand why something as simple as an address can't just be
stored in whatever file format you could name. Even csv would work! What
does a relational database do better when the only kind of search I do is
based on the contact name?