Updates Solr + fixtures, Moves DTU ORBIT backlinks.

- Updates Solr to 4.10.
- Updates Solr data fixtures.
- Moves DTU ORBIT backlinks to metrics box on single document page. Refs #1996.

You may need to delete your local Solr metastore and toc indexes living in
jetty/solr/(metastore|toc)/data prior to doing a rake metastore:testdata:index.