[Feature Request] Allow some Books to be public while all others defaulting to private/login #407

In my wiki I want all content to default to private unless explicitly made public.

Currently setting custom permissions on a Book to allow public viewing doesn't override the "Allow public viewing" setting (login is needed to access even public books). However enabling "Allow public viewing" results in all current Books being public.

I don't want to have to explicitly make content private, but there's no mechanism to make individual items public without making everything public and then hiding certain content.