Added a new solr field 'agent_uris' for any records with linked agents.

When listing an agent's linked records, search by the agent's uri for an accurate listing (rather than the agent's sort name).

Also fix sorting on the agent's detail page (ajaxified).
Increment migration number to avoid conflict
Merge pull request #683 from hudmol/fix-agent-linked-resources-listing

Fix a few things on the agent's public details page