Add milestones to LLS:DMNSSSDCLRTNNCT

Dominus Iesus: Declaration on the Unicity and Salvific Universality of Jesus Christ and the Church, promulgated in 2000 by the Congregation of the Doctrine of the Faith is the principle official Catholic teaching document since 1965 on its subject matter. Dominus Iesus is divided into numbered sections, which is also the proper way to cite it. Right now, there is no DI datatype, no division into articles, and (as expected) no page numbers. Inline Search, among other features, is next to useless. Please fix this document by giving it a datatype and milestones, as has been done with many official documents of the Magisterium of the Catholic Church (and should be done with all of them as a matter of course). Right now, LLS:DMNSSSDCLRTNNCT is not up to the standard of a Logos Research Edition, but this should be easy to fix.