Better support for searching tgrep with authority file IDs

It would be nice to be able to search the tgrep portal by authority file IDs. For example by clicking on the link of an authors reference.

Facetting by ID is already possible with tgsearch:

• http://dev.textgridlab.org/1.0/tgsearch-public/facet?facet=edition.agent.id&limit=0
• http://dev.textgridlab.org/1.0/tgsearch-public/facet?facet=edition.source.bibliographicCitation.author.id&limit=0
• http://dev.textgridlab.org/1.0/tgsearch-public/search/?q=*&filter=edition.agent.id:viaf:34551336

and to some extent with the portal:

• https://dev.textgridrep.org/search?filter=edition.agent.id:viaf:34551336

the filter on the left side looks wrong however.