[FFE] Merge apt-cacher-ng 0.9.1-1 (universe) from Debian unstable (main)

Please sync apt-cacher-ng 0.9.1-1 (universe) from Debian unstable (main)
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Changelog entries since current xenial version 0.8.9-1:

apt-cacher-ng (0.9.1-1) unstable; urgency=low

  * New upstream version

 -- Eduard Bloch <email address hidden> Sun, 28 Feb 2016 17:20:41 +0100

apt-cacher-ng (0.9.0-1) experimental; urgency=low

  * New upstream version

 -- Eduard Bloch <email address hidden> Mon, 01 Feb 2016 19:50:49 +0100
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Upstream changelog entries since current xenial version 0.8.9-1:

apt-cacher-ng (0.9.1) THE-DARK-NIGHT; urgency=low

  * FIX: correct human error message printing with recent glibc
  * FIX: corrected linking on systems that need additional libraries to be
    linked manually for socket IO while libwrap was not available
  * More file pattern changes for Ubuntu's do-release-upgrade tool
  * Better processing of filename sets in the "deletion" wizard (compressed
    parameter exchange for longer lists)
  * Database update

 -- Eduard Bloch <email address hidden> Sun, 28 Feb 2016 17:17:43 +0100

apt-cacher-ng (0.9.0) MAXIMUM-OVERDRIVE; urgency=low

  * FIX: Ubuntu Installer's ReleaseNotes fetching was interpreted incorrectly
    forced redirection of ISP to its auth page. Now keeping the target page
    in doubt, just making sure it's reloaded next time.
  * More volatile regexp's to cover requests from Ubuntu Installer, including
    the link that it uses to examine state of the network connection
  * FIX: Replaced "unofficial" uint type with unsigned (should resolve build
    problems under FreeBSDs)

 -- Eduard Bloch <email address hidden> Mon, 01 Feb 2016 19:48:10 +0100