The yaml test create a tree structure and modifies it by copying nodes
around and then moving them, checking that the child_of operator keeps
working afterwards. This test caught another edge case, as a follow-up
to the case of bug 708603
lp bug: https://launchpad.net/bugs/708603 fixed
bzr revid: odo@openerp.com-20110205004316-zaw9qqfke1bcw0s7