ProcGUI: fix death when pressing imp button in playback mode
Arduino: Merged daisy-chaining into base ADS1299

No more need for separate ADS1299Daisy class.  Only tested in 8-chan
mode.
Arduino: 16-channel ADS1299 working fine!
ProcGUI: runs with 16-chan OpenBCI!
Arduino: enables Aux data sampling and transmission
ProcGUI: adds Aux data reception and logging
ProcGUI: switching back to 8 channel mode
Merge pull request #15 from chipaudette/master

Arduino and ProcGUI: Integrate the 16-channel mode.  Add Aux Analog Input.