More updates to history diffs.

Add details of number of words added and deleted. Style paragraphs
and move ID tags to headers.
Update broken link
Pass zoom level as an option on single extent map
Delete unneeded file.
Make multiple updates for LR titles.

Commit in a huge splurge due to lack of time! Sorry.

Changes include:

* New "related documents" section
* Show summary of charges at top of document
* Entry titles
* Multiple small wording changes etc

Changes do not include nice CSS, unfortunately. Apologies for the
inline styles.

Also update local JSON with extra fields for titles.
Prettify table widths in title diffs section.

Add hack to fix broken char formatting, and remove unneeded JS code.
Merge pull request #149 from LandRegistry/property-title

Property title