Easier changing of settings for local development.

Create a local.py in settings/ - it has access to the current settings.
Update Section title to heading.

Follow on from changes in the SayIt app to have num/heading/subheading.
Fix traceback on instance homepage.
First go at scraping Labour speeches.
Cope with different container in older Labour speeches.
Labour speech scraper - name corrections.

Some manual name corrections, and some things which are obviously
not names to skip for now.
Add images to the labour speakers.

For now this is just hot-linked. We should perhaps consider storing
our own copy of the images, or better still hosting a PopIt of
politicians and using that.