util: scanner option: Beware that the exact case of option values may vary depending on the scanner driver

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
Merge branch 'stable' into unstable

Conflicts:
	src/paperwork/util.py

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
Multiscan: Fix multiscan end.

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
Merge branch 'stable' into unstable

Conflicts:
	src/paperwork/frontend/multiscan/__init__.py

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
Merge branch 'unstable' into wip-remake-scan-process2
Settings window: calibration scan (1.5/2)

known problem: weird blacks lines between scan chunks
still missing: animation

Signed-off-by: Jerome Flesch <jflesch@gmail.com>