'Spanish' is the correct term in English
Fixes #71
Publish more metadata via Dublin Core

id_number => relation
language => language
document.license => rights
document.language => language

This should increase the likelihood of a DOI making it into the Dublin Core.
Merge branch 'master' of github.com:eprints/eprints
First tests at adding facets to Xapian
Merge branch 'xapian_facets' of github.com:eprints/eprints into xapian_facets