Add ability to bypass the auto-detection code.  It used to be rock solid for me, but has gotten a bit flakey in bidirectional parallel port mode.
Add ability to bypass the auto-detection code.  It used to be rock solid
for me, but has gotten a bit flakey in bidirectional parallel port mode.

Fix a bug in bidirectional parallel port transfers, more work is still
needed here (testers welcome).

Minor cleanup.

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