prepare document detail for metadata links
connect the catalogue to the document save
remove the unwanted tag
fix documents models
update search tests to reflect the new documents global bbox
Merge branch 'master' of https://github.com/GeoNode/geonode into doc-metadata

Conflicts:
	geonode/documents/templates/documents/document_detail.html
Merge pull request #1005 from simod/doc-metadata

Document metadata download links