With the exception of use in three quotes as well as our inlcuded copy
of the GPL, all use of the Free Software Foundation's postal address
has been removed.
Re #320.
The backend worked incorrectly when scanning process was interrupted before the
current page was scanned completely. For example, scanimage tool could not scan
the next page if the previous one was interrupted. Now this issue is fixed.
See also "4.4. Code Flow" in SANE API specification v.1.06.
Also debug levels was changed to have better control over what should be
logged.