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Currently, async deletes don't work because the js submits them twice (once to validate the form, once to actually perform the action). If we assume deletes don't generally require form validation, then the problem is solved by adding a setting that skips the form validation step and submits it directly.
Added async delete code alongside the standard delete code to show how to use the new setting.
Added a functional test of async delete (note that since the page never reloads, now we get an empty table instead of a message that no books are in the database)