please add a jumper to disable auto reset

ladyada: have you used libftdi? Does it run under Windows? Do you know if the bit bang pins default to inputs or outputs (or if the mode persists through power loss)? It could be a problem if you had to explicitly set the bit bang pin used for reset to an input every time you powered up the board. Also, reading through the documentation, it wasn't clear to me which function actually set the states of the bit bang pins (I didn't spend much time on it); do you know?