Store ANT initialization in AutoANT script on SD card. 

I moved the initialization to AutoANT script on the SD card.  This should let us use different setups (my GoldenEmbed uses a TI C7 module) without changing firmware on the card.  If no "init.ant" is found on the card, it supplies one which contains the same initialization GE used before.

AutoANT lib is from http://opensource.quarq.us/autoant

Baudrate is still hard-coded.  I should fix that...