[ Chris Lamb]

* Improvements and bug fixes:

  - Pass the absolute path when extracting members from SquashFS images as we
    run the command with our working directory set to the temporary
    directory. (Closes: #964365, reproducible-builds/diffoscope#189)
  - Increase the minimum length of the output from strings(1) to 8 characters
    to avoid unnecessary diff noise. (Re. reproducible-builds/diffoscope#148)

* Logging improvements:

  - Fix the compare_files message when the file does not have a literal name.
  - Reduce potential log noise by truncating the has_some_content messages.

* Codebase changes:

  - Clarify use of a "null" diff in order to remember an exit code.
  - Don't alias a variable when don't end up it; use "_" instead.
  - Use a  "NullChanges" file to represent missing data in the Debian package
    comparator.
  - Update some miscellaneous terms.