Add `nwbibspatial` & `nwbibsubject` query params and search options

See https://github.com/hbz/nwbib/issues/54
Restrict suggested subjects for `nwbibspatial` and `nwbibsubject`

See https://github.com/hbz/nwbib/issues/54
Use full `nwbibspatial` and `nwbibsubject` URLs

- insert full URL on autosuggest
- update rendering to display short notation
- use new advanced search options when browsing classifications

See https://github.com/hbz/nwbib/issues/54
Display title, author, and NWBib subject fields in advanced search

See:
https://github.com/hbz/nwbib/issues/54
https://wiki1.hbz-nrw.de/display/SEM/NWBib-Treffen+10.9.2014