Now that misc objects may be inserted at the very bottom, remove the requirements that PU objects have no children
Now that misc objects may be inserted at the very bottom, remove the requirements that PU objects have no children

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@1922 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc