Distinguish more clearly between BCNLAT HYDRO and IENC features This allows importing them from different sources while keeping the history of data intact. Additionally, storing them in different tables also allows to have different attributes (here only dirimp via an m:n-table) and different constraints (currently not implemented) according to the IENC feature catalogue. Since both new tables inherit from a table with the same name as the old table, all entries still can be accessed via a table of the same name. Thus, no changes to GeoServer layers are necessary. ToDo: solve layout problems in the client SPA.