scsi_debug 1.65 for lk 2.5.48

The scsi_debug version in lk 2.5.48 is the second last one I sent to this list. So this patch includes the changes from the last one I sent:
- fix "in use" counting [hch]
- clean up bios_param() code
It also merges a sysfs re-organisation from Mike Anderson.

Doug Gilbert