canon_dr backend v43

- initial DR-M140 support
- add extra_status config and code
- split status code into do_usb_status
- fix copy_line margin offset
- add new color interlacing modes and code
- comment out ssm2
- add timestamp to do_usb_cmd
canon_dr backend v44

- buffermode support for machines with ssm2 command
- DR-M140 needs always_op=0
canon_dr backend v45

- dropout support for machines with ssm2 command
- doublefeed support for machines with ssm2 command
fujitsu backend v120

- only call hopper_before_op code at batch start
- remove unused backup/restore_params
Canon Pixma MX410 is working