Debian DLA-58-3 : apt robustness improvements

The recent security updates to apt make apt bug 710924 1 much easier to trigger. Affected users see '416 Requested Range Not Satisfiable' errors during a apt-get update operation. With the 0.8.10.3+squeeze7 upload the fix for this error that was originally introduced in version 0.9.12 2 is now...