installation: location of demo_table_jui.css

* Fixes location of demo_table_jui.css by explicitly referencing last
  git tag that contained the file.

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
Merge pull request #1954 from kaplun/fix-install-demo_table_jui

installation: location of demo_table_jui.css
BibIndex: bibauthorid performance improvements

* Re-implements get_author_canonical_ids_for_recid() to bypass
  complex BibAuthorID API usage and directly retrieve data
  from the DB for a gain of speed of ~800x.

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
Co-authored-by: Alessio Deiana <alessio.deiana@cern.ch>
Co-authored-by: Samuele Carli <samuele.carli@cern.ch>