* Switch default view class to Gtk3 and replace python-gobject dependency with python-gi. * Port away from old-style apt.Package candidateFoo and installedFoo properties, preferring candidate.foo and installed.foo. In a number of cases we have to check whether candidate/installed is non-None first. * Use apt_pkg.version_compare rather than apt_pkg.VersionCompare. * Use apt_pkg.uri_to_filename rather than apt_pkg.URItoFileName. * Use apt_pkg.TagFile (and related new-style API) rather than apt_pkg.ParseTagFile. * Use apt_pkg.PackageManager rather than apt_pkg.GetPackageManager. * Use apt_pkg.Acquire rather than apt_pkg.GetAcquire. * Use mark_foo/marked_foo rather than markFoo/markedFoo. * Use apt_pkg.ActionGroup rather than apt_pkg.GetPkgActionGroup. * Use apt_pkg.ProblemResolver rather than apt_pkg.GetPkgProblemResolver. * Use apt_pkg.read_config_file rather than apt_pkg.ReadConfigFile. * Use new spelling of apt_pkg.DepCache methods. * Rename several local cache methods to PEP-8 style to avoid showing up in the output of /usr/share/python-apt/migrate-0.8.py. * Use apt_pkg.size_to_str rather than apt_pkg.SizeToStr. * Use apt_pkg.PackageManager.get_archives rather than apt_pkg.PackageManager.GetArchives. * Use apt_pkg.Acquire.fetch_needed rather than apt_pkg.Acquire.FetchNeeded. * Use new spelling of apt_pkg.Package/Version/Dependency methods. * Use apt_pkg.pkgsystem_lock rather than apt_pkg.PkgSystemLock. * Use new spelling of apt_pkg dependency parsing methods. * Use new spelling of apt_pkg.SourceList methods. * Bump python-apt (build-)dependency to >= 0.8.0. * Merge branch from Michael Terry to drop auto-upgrade-tester from update-manager and move it into its own source package * Begin refactoring of Computer Janitor code by renaming and re-situating all of it to janitor/plugincore. This will eventually be removed from here into its own separate branch. * Merge the temporary Python 3 sprint branch back into trunk, and close the py3 sprint branch.