Increase recursive paragraph limit

Having a cap on recursive instantiation of paragraphs is good and sane, but the current limit of 4 is a little too limiting.

For my use case something more like 5 or 6 would work.

Personally, though, I think it should be set to something absurd like 15 to leave sufficient leeway for crazy applications, so that if you do hit it it's far more likely to because of actual infinite recursion rather than exuberant overuse of a new toy.