- rewrite of calibration process to make it more robust and accurate
- untested full support for hp3670
- untested support for 50, 100 and 300 uncalibrated scans for hp2400
- use of id for device parts descriptions instead of using fixed
place in tables
- SCAN_MODE_* defines to clean up code
- fixed allocation bugs detected by valgrind
- fixed bugs detected by 'tstbackend -r 1 -l 1'
- allow 'genesys' as default value for backend opening
- made OPT_COLOR_FILTER effectively work for GL646 scanners
- split sane_control_options() to make it more readable
options for enabling/disabling horizontal interpolation at high
resolutions and selection of color filter in grayscale and
lineart modes.
* backend/genesys_gl841.c: implemented color filter selection.