Add `set` query parameter, advanced search option, and search links

If the `set` is non-empty it overrides the default NWBib set.

Details views for `Journal` and `Series` type resources get links
to search for contained titles (`isPartOf` the journal or series).

See https://wiki1.hbz-nrw.de/x/BgCHAg
Don't display encoded HTML entities in selected facet and tables