0.9.0

• Some pedantic stuff (use long options for aptitude and apt-get to
  ease code reading). Don't fail on untrusted/unauthenticated packages
  when checking for upgrades (still check for the upgrade itself).
  (Contributed by Mathieu PARENT due SF Bug#3158198)
• Check for updates (refresh) using dist-upgrade. This show
  ABI-incompatible upgrades (like the recent bind9 one:
  http://www.debian.org/security/2010/dsa-2130.en.html).
  (Contributed by Mathieu PARENT due SF Bug#3158198)
• Make upgrade method customizable and change default to dist-upgrade.
  (Inspired by Mathieu PARENT due SF Bug#3158198)
• Allow apt-dater-host to be used with ssh keys.
  (Inspired by 'Chromosom' due SF Bug#2862139)
• Implement multiple cluster support (debian, rug, yum, zypper).
• zypper:
  • Fixed: zypper did not report any updates (reported by Ivan De Masi).
  • Use 'zypper refresh' for refreshing package repositories.
• Add RELEASE header to version string on RPM queries.
• Use apt-get as default package manager.
  (Closes Debian Bug#635048 by Felix Bartels)
• Add dummy man page apt-dater-host.1 (contributed by Pattrik Matthäi).
• Enable apt's update download cronjob.
• Track kernel updates using /etc/kernel/postinst.d.
• Catch and report config file errors.
• Use ImVirt.pm instead of the legacy imvirt binary on Debian.