Policy should be reviewed and/or merged with latest debian-policy

[Dave Walker]

The current packaged policy seems wedged at 3.8.2.0ubuntu1, where as Debian is now at 3.9.2.

We should look to see if we should merge latest policy, and determine if the current delta needs extending.

Particular attention should be made against:
     3.3
          The maintainer address must accept mail from Debian role accounts
          and the BTS. At least one human must be listed with their
          personal email address in `Uploaders' if the maintainer is a
          shared email address. The duties of a maintainer are also
          clearer.

... As any package with a Ubuntu delta seems to break the Standards Version of 3.9.2 due to https://wiki.ubuntu.com/DebianMaintainerField (noting that our current Lintian warns on out of date standards where version < 3.9.2)