I have no idea if we'll need it, but it will be nice to have on hand if we do.
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We put a white stripe on the pin 1 end of all of our cable connectors. The fat, white stripe on the PCB will help those of us with old eyes figure out where pin 1 goes.
Even though most of the signal pins have multiple uses, the board just isn't big enough for all of the signal names. The names chosen were guesses about how we would use them.
The ceramic caps across 5V and ground are for peace of mind and completely optional. All the LED does is say "this thing has power".
The board was done in Eagle 7.20. Once we've tested it we'll add a link to the files.