* Merge from debian unstable. Remaining changes: - when upgrading, ensure the index is fully rebuild (in the background) to ensure that we get updated information in /var/lib/apt-xapian-index/{index.values} and that the index fully utilizes the new plugins (LP: #646018) - use ionice for the index building - do not crash if the DB is already locked (LP: #590998) - data/org.debian.AptXapianIndex.conf: fix policy - move to dh_python2 - update-apt-xapian-index-dbus: + fix type of "start-time" for policykit (LP: #675533)