could happen if there once was a IPv6 connection, but now is not any more.
it now kills infos older than 3 minutes from the session.
it also shows the age of the infos now on the hosts overview view (but not on home view due to cosmetic reasons).
optimization: only request the fake images for ipv4/v6 detection if we don't have a fresh IP already.
added example settings for using detectip on (ip6-)localhost
remove unneeded stuff from settings
(we still need some in conftest.py for the tests, though)
init DB for tests via conftest.py
more update algorithm choices
give origin zone (if we already know it) to dnstools functions
new views: DomainOverview, DeleteDomain
unify deletion templates using delete_object.html
add django-extensions
