Reorganize headings and exhibit navigation and include checks for page navigation.
Check for page description.
Implement nested page nav, create child page nav helper, use in show.php.
Fix first child selection.
Make next/previous/up use page names.
Add default styles for exhibit nav links.
Replace up links with trail of all parents.
Remove unused exhibit_builder_nested_nav.
Fix "Add Another Page" redirect.
Resolve merge conflicts.
Use non-misleading id.
Merge remote-tracking branch 'origin/2.0-exhibit-layouts'