Update lintian manpage (long URL) overrides
Updated Standards-Version to 3.9.6; no changes required
Adjusted changelog so it didn't look like a commitlog.
Added standards version change to changelog.
Simplified handling of LICENSE.TXT.

For some reason, LICENSE.TXT was specified in debian/docs,
which caused a lintian warning to be raised. Instead of
removing the reference from debian/docs, the file was
excluded from installation in override_dh_installdocs,
which is just redundant.

Removed both references so LICENSE.TXT is not installed
or removed. This is better and also lintian-clean.

Thanks to Luciano Bello for noticing this.
Instruct Git to ignore debian/ipv6toolkit
Fix oui patch: conf file should point to /var/lib/ieee-data
changelog: will use the default urgency=medium
changelog: per Luciano's suggestion, upload beta to experimental