Import Debian changes 0.7.3-5

Import Debian changes 0.7.3-5

jigdo (0.7.3-5) unstable; urgency=medium

  * Switch addresses from atterer.org to atterer.org in various places
    (Closes: #609816)
  * jigdo-lite: use tmpDir when creating images. Closes: #578325
    Thanks to Mateusz Poszwa for the patch.
  * jigdo-lite: Cope with https URLs. Closes: #865864.
    Thanks to s3v for the patch for inspiration.
  * jigdo-lite: Unset GREP_OPTIONS at the start. Closes: #767318
  * jigdo-lite: Read/store the filesPerFetch setting from the config
    file. Closes: #826781
  * jigdo-file: Fix building with glibc >= 2.25. Closes: #880981
    Thanks to Matthias Klose for the patch.
  * Various packaging changes:
    + Switch source format to 3.0 (quilt) and split up patches a little
    + Update to Standards-Version: 4.1.1
    + Switch Priority to optional
    + Improve cross-building. Closes: #864516. Thanks to Helmut Grohne for
      the patch