Publish all external resources

Publishes every external resource for the project to NADA. For each resource, metadata is POSTed to {catalog}/index.php/api/resources/{study_idno} with overwrite set to yes. If the resource has a stored file (filename is set and not an external URL), the file is then uploaded to {catalog}/index.php/api/datasets/{study_idno}/files, matching the single-resource publish behavior. Request body JSON (if any) is accepted but not applied.