Nx tool proposal

This is a preview for a little tool that helps to manage nitdoc generation from neo4j model.

TODO:

* [ ] Better lazy loading to avoid allocation of very large blocks
* [ ] Documentation
* [ ] More tests and nitunit
* [ ] Debugging

This PR also contains some fixes to `neo4j` and `ini` in order to make `nx` work.
un fichier config par repertoire ?
tu peux utiliser xdg_basedir si tu veux avoir un fichier par user