TOC abstracted from the layer. Use this style for footer links
Appendix titles now account for 'Reserved' and have a sane default
Chrome's TOC uses new toc type
Reverse lookup subterp. Use subterp in interpretations layer
Remove RegUrl usage
Sidebar works like partial wrt subterps
Update tests
Remove RegUrl and table_of_contents
Remove duplicated code from toc layer
PEP8
Tests for subterps, toc. Add default for title parsing
Merge pull request #548 from cmc333333/subterp-reengineer

Subterp Re-engineering