Repository migration, history cleanup

- Git History has been purged so as to get rid of sensitive data which have been versioned like personal email address etc.
Commits vwhere not signed with GPG keys, and DCO not applied.
To avoid doxing, bots, social engineering and issues, everything has been reset.
A good example for my students I described [in some meetups](https://speakerdeck.com/pylapp/comment-aborder-et-contribuer-sereinement-a-un-projet-open-source).

- The project has been created in 2016 and live until 2020

Signed-off-by: Pierre-Yves Lapersonne <[email protected]>