Merge from mvo

Merge from mvo
Patches applied:

 * michael.vogt@canonical.com--2004--laptop/apt--authentication-mvo--0--patch-2
   * ignore errors when a Packages.bz2/Sources.bz2 can't be found and try with Packages.gz/Sources.gz again

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--base-0
   tag of apt@packages.debian.org/apt--main--0--patch-34

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--patch-1
   * merged matt's tree (with all those apt-authentication changes)

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--patch-2
   don't display a error if a bzip2 package can not be downloaded, just ignore (Ign) it

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--patch-3
   * "chmod 755 cmdline/apt-key", changed version to 0.6.27ubuntu1

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--patch-4
   * fix for a stupid merge error (from 0.5->0.6)

 * michael.vogt@canonical.com--2004--laptop/apt--mvo--0--patch-5
   * unstable should really be hoary