Also, something important we should do now:
educate the previous extra-addons users and committers about the new
branches to avoid the maintenance to happen in the extra-addons
instead of using these new branches.
What can we do for that?
1) send summary emails to the communities, I'll do it
2) remove the extracted modules from the extra-addons? That's a bit
brutal for the beginners following these branches may be. Something we
could do instead could be add some kind of raise an automatic
exception when the code of the module is read, something like "that
modules moved to branch X, please download and use branch X or delete
that code line alternatively if you want to ignore that warning"
