Updated requirement text to follow common pattern
Making sure you can't say the data wasn't gathered by you without indicating where it did come from
Tweaks to privacy questions to reference DPA terms etc
Move 'more...' links from requirements to help
Added questions around findability
Removed constraints around UKGov licence

Which licence to use is a matter of policy; for the same reason we
don't dictate a particular data catalog to publish in, we don't talk
about UKGov policy around licensing within the certificate.
Changed around privacy questions for those who are exempt from Data Protection Act
Changed wording around guarantees
Added possibility of waived/expired rights
Added waiver support when specifying licence for third-party sources of data/content
Adding descriptive subtitles on each section

Suggested by Ed Parkes, to help people to understand why the questions
in a particular group are being asked.
Merged changes from master