HP44x0c
I'm working on the color mode 600dpi.
It is working, but there is a little issue with the colors.

Next steps
- Fix the 600dpi color mode
- investigate and identyfy the regs for the resolutions
- implement more resolutions
- investigation, if it running with all mainboards
- Xfer-module sane_hp_rts88xx/hp_rts_saneiusb.c isn't working
- Xfer-module sane_hp_rts88xx//hp_rts_libusb.c  isn't working done

- XPA mode for hp4470                    ,  done
- Sourecode sorted for more scanner types,  running for hp35x0C

HP35x0C
For color mode only.
It shoes, that we have a wrong resolution setup.
The rtscan demo program works fine.
Investigation is running.