Merge branch 'release/debian/1.0.31-1_experimental1' into masterdebian/1.0.31-1_experimental1

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 <!-- -*- Mode: markdown -*- -->
 
+## New with 1.0.31 (released 2020-08-23)
+
+### Backends
+
+- adds the `canon_lide70` backend
+- `avision`: adds support for the KODAK i1120, fixes thread
+  cancellation issues, disables exposure option for non-filmscanners
+- `canon_dr`: improves error reporting
+- `dmc`: fixes compiler warnings on the scan area options
+- `epsonds`: rewrites the network I/O following changes made to the
+  `epson2` backend in 1.0.30 to fix security issues.  Network support
+  is still unsupported.
+- `escl`: adds ADF support, fixes many minor issues and improves error
+  handling.  Now also supports devices behind a proxy (needs explicit
+  configuration).
+- `fujitsu`: adds support for the fi-800R and a card scanning slot,
+  fixes a bug when reading hardware sensors on the first invocation.
+  Adds USB IDs for fi-7800 and fi-7900.
+- `genesys`: adds support for the Canon 5600F, Canon LiDE 90, Plustek
+  OpticFilm 7200 and 7200 (v2), 7400, 7600i, 8100 and 8200i.  Fixes
+  several issues with the Canon 8600F.  Adds 4800dpi support for the
+  Canon LiDE 210 and fixes 3200dpi flatbed support on the Canon 8400F.
+  Adds an option to fill dark calibration with a constant.  Adds
+  transparency support for gl847 chipset based devices.  Fixes CIS
+  scanner support for gl842 chipset based devices.  Removes lineart
+  and image enhancement emulation support.
+- `gphoto`: supports the PLANon DocuPen RC800 (with a recent enough
+  version of `gphoto2`)
+- `gt68xx`: modifies scan cancellation behaviour
+- `hp5400`: adds button support, fixes a scan cancellation crash issue
+- `pixma`: add supports for the i-SENSYS MF440 Series and untested
+  support for the PIXMMA G7000 Series and GM4000 Series as well as the
+  i-SENSYS MF720 Series.
+- `plustek`: fixes a potential buffer overrun
+- `test`: adds gamma options
+
+### Documentation
+
+- removes the SANE Standard.  This is now maintained as a separate
+  project at https://gitlab.com/sane-project/standard.  HTML and PDF
+  versions can be found at https://sane-project.gitlab.io/standard/.
+- adds and updates information for multiple supported and unsupported
+  devices
+- translation updates for British English, French, German, Italian and
+  Ukranian
+- `scanimage`: documents the JPEG compression level
+- minor improvements documenting build requirements
+
+### Build
+
+- removes the `--with-api-spec` option from `configure`
+- replaces the `--enable-avahi` option with an `--with-avahi` that
+  defaults to enabling if possible.  If the option is given and the
+  required support is not available, `configure` will exit with an
+  error.
+- improves checking for libjpeg version dependent requirements
+- has been made reproducable (#228)
+- fixes build issues on MinGW
+
+### Miscellaneous
+
+- fixes OpenBSD hotplugd scriptlets (!375)
+- fixes support for unconfigured USB scanners on MacOS (#38)
+- various fixes and improvements in the USB record/replay support
+- fixes a file descriptor validation test in sanei_pio
+- adds missing include in sanei_usb
+
+
 ## New with 1.0.30 (released 2020-05-17)
 
 This release fixes several security related issues and a build issue.