Increase throughput between USBPcapCMD and USBPcapDriver.

USBPcapDriver:
Set DO_DIRECT_IO instead of DO_BUFFERED_IO in control device.

USBPcapCMD:
Add commandline option (-b) to specify buffer size.
Make user-mode buffer same size as kernel-mode buffer.
Fix overwrite prevention in circular buffer.
Tag version 1.0.0.3.