Universal link

All the UniversalLink things should be working. This includes the UniversalLink class, the associated Daos, and the Loader.  Additionally, the filter concept has been condensed into a ubiquitous DaoFilter for use with all Daos.  Likewise, the Dao method get(DaoFilter) has been added to the Loader interface and implemented in every Dao.  Finally, I added a Redirect class for consistency and to properly implement the aforementioned get() method.