Comment 4 for bug 2009891

Working branch user/jeffdavis/lp2009891-carousel-api-additions-2 has a revised fix (top 3 commits):

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/jeffdavis/lp2009891-carousel-api-additions-2

In this branch, open-ils.actor.carousel.get_contents uses container.biblio_record_entry_bucket_item as the core table, and we also use reporter.materialized_simple_record instead of metabib.flat_display_entry to retrieve author and title information. This resolves the performance problem reported above.