Tidy up file imports, and use of verbosity.
Make use of popit_url optional in import script.
Remove class overrides when making speeches on import.
Factor out ZA assuming only one debateSection to its own subclass.
Factor ZA name function to its subclass.
Correct exception name.
Assume UTF-8 encoding of text.
Allow Section title to be optional.
Expand importer's range of known elements.

Include XML elements when fetching text content, not just text,
and error on unknown hierarchy elements.
Construct title from any num/heading/subheading elements present.

Optional, so don't mind if they're absent.
Add date handling in speeches and in preface.
Utilise by attributes and TLCPerson meta headers on import.
Handle ZA's slightly different current AN use.
Class fix for displaying speaker with no speeches.
Make sure instance has to be given in import management command.
Sections are unique on (parent,instance), not just parent.

This is so that parent-less Sections can have the same
slug in different instances.
Set bleach defaults to what we want to show, allow HTML in database.

Adjust output for dealing with possible HTML in places,
including search results (which need HTML for highlighting).