Version-based repo migration and step for restructuration of HGRCs in 0.7.0
We'll now have a version-based migration system (it's not always possible to know without a version number whether a step has to be done or not), meaning that the HEPTAPOD_VERSION
file in heptapod/heptapod has to be bumped upon release.
We then leverage the new system to rewrite HGRCs according to heptapod#91 (closed) and heptapod#103 (closed)
Edited by Georges Racinet