dom-net is moved to obsolete

The domain network (dom-net) attribute of the domain object is moved to obsolete. We know only one objection: the dom-net attribute can be used to check whether an organization requests space from different sources/blocks. But dom-net is almost unmanageable then it is easy to foiled this argument. If there is no serious argument against this change the domain object template will be (definitively) updated. Regards Francis.Dupont@inria.fr