Change createOrganisationFromM0 because all organisation must have one corporate registration code. But we can find the head office, the second company or branch thanks to source reference.
So I modify several scripts to respect this change.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22885 20353a03-c40f-0410-a6d1-a30d3c3de9de