* The dataone theme now uses the same DataCatalogView as other themes
since geohashes are indexed.

* Created a way for the Search model to check if a filter/index field is
available before adding to a query. Filters can be removed from a model
by taking it out of the 'defaults' object in the Search model.

* The dataone theme does not have the characteristic, standard, and
other semantics fields.

* Misc. reorganizing of the Search model and DataCatalogView