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epson2: better timeouts

See merge request !605

Resolve "genesys backend crashes during exception handling"

Closes #464

See merge request !621

Hopefully, I will get it right this time. Uses 4 space indents rather
than 2 as used elsewhere in the code base.

scanimage: mention when an option is advanced

See merge request !613

Enable Slide advance on DigitDia 4000 and correct misspelling

See merge request !620

approximate slope tables with formula a/(1+b*(x-c))

genesys: use usleep instead of std::this_thread::sleep_for to re-enable thread less compile

See merge request !619

Fixes:

  genesys/scanner_interface_usb.cpp: In member function ‘virtual void genesys::ScannerInterfaceUsb::sleep_us(unsigned int)’:
  genesys/scanner_interface_usb.cpp:484:10: error: ‘std::this_thread’ has not been declared
    484 |     std::this_thread::sleep_for(std::chrono::microseconds{microseconds});
        |          ^~~~~~~~~~~
Signed-off-by: Peter Seiderer <ps.report@gmx.net>

Fix scan all resolution with JPEG.

See merge request !617

Add models Canon TR455X

See merge request !618

genesys: add back Plustek Optifilm 7200 V2 config.

See merge request !612

This has support in the backend and user reports works. I think this
might just be an oversight.

epson2: disable focus properly

See merge request !604

epson2: improve descs

See merge request !606

Resolve "HP ScanJet 4200C backend causes segmentation violation"

Closes #454

See merge request !607

So we can mark them as "complete" now.

Only the epson2.desc has entries pointing to other backends. Remove them
and update the backends which really support them instead.

The comment says it all.

With my 12000XL, using autofocus takes ~35 sec before scanning starts.
So, extend the default USB timeout.

The old epson driver disabled the focus by erasing the setFocus command.
The epson2 driver turned it into a seperate flag. However, scanners
which disabled focus in post_init were not converted to use the new
flag. Because we meanwhile set focus during init, these scanners could
not start anymore. Convert them to use the new flag.

While here, update the comment how we handle focus detection and update
the debug strings accordingly.

Bug reported by Hans Meir and debugged by Zdenek Dohnal. Many thanks!

- rewrite do_cmd() timeout handling
- remove long timeout TUR from v61 (did not help)
- allow config file to set initial tur timeout for DR-X10C (#142)

- allow config file to set inq and vpd lengths for DR-M1060 (#263)

Resolve "Issues in SANE man pages"

Closes #433

See merge request !598

Add function to debug avision command

See merge request !595

Define a new enum that contains Avision data type codes and use those instead
of pure values. I also added a couple of helper functions for debugging the
command operation and data type code if read or send.

Update release documentation

See merge request sane-project/backends!596