Add Sort by Author Ascending/Descending options to Bookmarks and Lists in patron accounts.

Along with Title and Date Added, this is an option in WebPAC that patrons are used to having. It also makes sense to have consistent view/sort behavior across the catalog. So, since patrons are/will be able to sort search results, checkouts, holds, and reading history by author, they should be able to do the same with other lists, as well.