Changes to Auto Configure

Decided to add the code to change the guard time to very short.  This
makes the startup very quick and as such don't need the EEPROM/R1 bypass
code.

Also ran into issue with Teensy, that when just powered up, the Teensy
some how puts XBee into 9600 command mode, which takes 10 seconds to
time out.  I have run into times in past where sometimes things would
come up fine and others, took a long time to connect, So adding code to
blindly output "ATCN" at 9600 baud at startup time, which will exit the
command mode if by chance it got into it...