Releasing 3.9.3
Add support for the Samsung Unified Driver (SUD) which enables ADF Duplex and correct colour
mode selection. Note that SUD's document source is not the standard SANE NAME_SCAN_SOURCE so
the SUD-specific "doc-source" is queried if the SANE "source" fails to find an option.

Tested on Samsung CLX-6220FX with ADL Duplex.
Add support for the Samsung Unified Driver (SUD) which enables ADF Duplex and correct colour
mode selection. Note that SUD's document source is not the standard SANE NAME_SCAN_SOURCE so
the SUD-specific "doc-source" is queried if the SANE "source" fails to find an option.

Tested on Samsung CLX-6220FX with ADL Duplex.
Use --debug in VALAFLAGS instead of -g which confuses autotools in distcheck
Releasing 3.9.4
Add missing gresource file to tarball