Search System Improvements

Status: Completed by @mire.

The default DSpace search system does not meet the needs of Dryad.

Requirements

 * Search results should always show publication, with the related authors and datasets listed below the relevant publication.
 * @mire notes that this will be much easier if each DSpace item contains correct metadata in the dc.type field, so datasets can easily be discriminated from publications.
 * Publications should be searchable via DOI. This will ease linking from a dataset to its primary publication.
 * Advanced search should contain fields relevant to Dryad searches.
 * Publications should be searchable via OpenURL.

Open Questions

 * What fields should be searchable in the advanced search page?