Add LIN protocol.

Check the Microchip MCP2021 transceiver.

LIN is UART with a transceiver. Adapter board designed and waiting testing.

Adapter in SVN here: http://code.google.com/p/the-bus-pirate/source/browse/#

Here's a list of LIN app notes from Microchip: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2143&param=en023255&section=5

I originally thought LIN was just UART over a single wire with a transceiver, but it also has some special characters and auto baud rates (I believe). I have yet to find public domain LIN code in C to include in the project. I'm going to remove myself as the owner, but leave the project as 'started'.