* backend/plustek-pp.h backend/plustek-pp_ptdrv.c backend/plustek_pp.c:
fixed "not homing" problem, the sensor did not return when
the driver gets the _IOCTL_STOP command
fixed compilation issue for kernels > 2.6.15
fixed compiler warning conditions
* backend/plustek_pp.c: Bumped build number.
* backend/plustek-pp_ptdrv.c backend/plustek-pp_detec.c:
Fixed bug, that prevents backend from working, when the device
is another parport than parport0 - spotted by Christoph Steinbruchel.
All the supported CanoScan devices should work now correctly.
Moved the Plustek parallelport support into a separate backend: plustek_pp.
Added new backend for Plustek ASIC 9600x/9800x based parallelport scanner.