[PATCH 0 of 7] README (I explain change from the previous version)

[Pierre-Yves David]

Newest version can be previewed here: http://hg-lab.logilab.org/wip/hg/rev/7dc3434ab107

Most issues have been tackled but:

- String version versus integer version, I need to discuss that with matt

- Terminologies, the current code use three terms: obsolete, precursor and successor. I'm not very happy of that yet.

I'll resend the series once those point are done.

-- 
Pierre-Yves