* merged with matt's tree

Patches applied:

 * apt@packages.debian.org/apt--main--0--patch-52
   0.6.31

 * apt@packages.debian.org/apt--main--0--patch-53
   Remove debugging from apt.cron.daily

 * apt@packages.debian.org/apt--main--0--patch-54
   allow SHA1Summation to process a file descriptor until EOF

 * apt@packages.debian.org/apt--main--0--patch-55
   Fix syntax in sha1.cc

 * apt@packages.debian.org/apt--main--0--patch-56
   Fix build/install of Polish offline documentation

 * apt@packages.debian.org/apt--main--0--patch-57
   Move CD-ROM handling backend into libapt-pkg

 * apt@packages.debian.org/apt--main--0--patch-58
   Fix compilation errors from apt--auth-cdrom--0

 * michael.vogt@ubuntu.com--2005/apt--auth-cdrom--0--base-0
   tag of apt@packages.debian.org/apt--main--0--patch-51

 * michael.vogt@ubuntu.com--2005/apt--auth-cdrom--0--patch-1
   * added support for signed cdroms

 * michael.vogt@ubuntu.com--2005/apt--auth-cdrom--0--patch-2
   * merged with apt--main, seperated cmdline/apt-cdrom.cc into a library (apt-pkg/cdrom.{cc,h})

 * michael.vogt@ubuntu.com--2005/apt--auth-cdrom--0--patch-3
   * cleaned up the cmdline/apt-cdrom.cc code