Add support for "set date time" operation; fix Linux build (reported by wawachief).

Signed-off-by: Lionel Debroux <lionel_debroux@yahoo.fr>
Tested-by: Xavier "critor" Andréani <andreanx@hotmail.com>
When receiving backup fails (usually due to packet loss in the Windows HID stack...), attempt to salvage data nevertheless. Add po/Makevars file (reported by wawachief).

Signed-off-by: Lionel Debroux <lionel_debroux@yahoo.fr>
Skip leading UTF-16LE BOM, if any, for programs, as the program interpreter chokes on it. Reported by wawachief.

Signed-off-by: Lionel Debroux <lionel_debroux@yahoo.fr>