Reproducible Builds: Weekly report #89

[ Chris Lamb ]

* Optimisations:
  - Avoid multiple iterations over archive by unpacking once for an ~8X
    runtime optimisation.
  - Avoid unnecessary splitting and interpolating for a ~20X optimisation
    when writing --text output.
  - Avoid expensive diff regex parsing until we need it, speeding up diff
    parsing by 2X.
  - Alias expensive Config() in diff parsing lookup for a 10% optimisation.

* Progress bar:
  - Show filenames, ELF sections, etc. in progress bar.
  - Emit JSON on the the status file descriptor output instead of a custom
    format.

* Logging:
  - Use more-Pythonic logging functions and output based on __name__, etc.
  - Use Debian-style "I:", "D:" log level format modifier.
  - Only print milliseconds in output, not microseconds.
  - Print version in debug output so that saved debug outputs can standalone
    as bug reports.

* Profiling:
  - Also report the total number of method calls, not just the total time.
  - Report on the total wall clock taken to execute diffoscope, including
    cleanup.

* Tidying:
  - Rename "NonExisting" -> "Missing".
  - Entirely rework diffoscope.comparators module, splitting as many separate
    concerns into a different utility package, tidying imports, etc.
  - Split diffoscope.difference into diffoscope.diff, etc.
  - Update file references in debian/copyright post module reorganisation.
  - Many other cleanups, etc.

* Misc:
  - Clarify comment regarding why we call python3(1) directly. Thanks to Jérémy
    Bobbio <lunar@debian.org>.
  - Raise a clearer error if trying to use --html-dir on a file.
  - Fix --output-empty when files are identical and no outputs specified.

[ Reiner Herrmann ]
* Extend .apk recognition regex to also match zip archives (Closes: #849638)

[ Mattia Rizzolo ]
* Follow the rename of the Debian package "python-jsbeautifier" to
  "jsbeautifier".

[ siamezzze ]
* Fixed no newline being classified as order-like difference.

[ Ximin Luo ]

* Stop advertising variations that we're not actually varying.
  That is: domain_host, shell, user_group.
* Fix auto-presets in the case of a file in the current directory.
* Allow disabling build-path variations. (Closes: #833284)
* Add a faketime variation, with NO_FAKE_STAT=1 to avoid messing with
  various buildsystems. This is on by default; if it causes your builds
  to mess up please do file a bug report.
* Add a --store-dir option to save artifacts.