Appendix Compilation: Whole Appendices

* Allow the same type of paragraph label to appear at multiple depths (e.g. 1234-A-a-2-a)
* Appendix header -> paragraph conversion is only triggered by parens (not periods)
* Heading "for|of" part + section is caught (there will be another pull request to make this even more general)
* Convert AMDPAR-style appendices into Node-style appendices
* Use the child_labels field as an indicator of order
* Turn on whole appendix parsing