Use in-db unapi to display record summaries

Use in-db unapi to display record summaries

Now that we're pulling copy/location/volume/status attributes from in-db
unAPI rather than mk_copy_query's massive JSON query, populate the
holdings hash with the required attributes and cut over to the
corresponding attributes in the record summary table.

We are approaching uniform access to copy info between search results
and record summaries.

Signed-off-by: Dan Scott <dscott@laurentian.ca>