Move navigation into views, as it will be more tightly coupled with utils
Rely on modified TOC for prev/next links
Remove un-used functions; fix missing semicolon
Update tests to use proper nav methods
PEP8
Make check_tree a method rather than a bool. Use that the check that a subterp exists
Test subterp's check_tree
Use subterp urls for the links in the definitions view and the slide-down interps
JS tweaks to make loading an interp from a definition work
PEP8
Merge pull request #542 from cmc333333/subterp-footer

Subterp footer links
Merge pull request #544 from cmc333333/subterp-anchors

Pick the correct subterp when creating a link
un-bork reg list on mobile landing page
Merge pull request #543 from cmc333333/subterp-404

Subterp 404
decrease outdent for interpretation markers in the appendix
header tweaks
add bottom border to opening definition
give definitions a bottom border when open
give slide down interp headings some room to breath
Merge remote-tracking branch 'upstream/master' into css-fixes