Arduino: shogo corrected a bug for stable eye checking.
TDT: For MainWindow.m, shogo added reseting part for preview
     to prevent up-side-down display for mouse face.
TDT: LFP data will be saved.
     Additional CS digital output channel.
2 updates
1. Electrical stimulation during conditioning
   for this purpose, I added a trigger value of 'StartCam'.
   In previous version, trial were trigged by different values
   depending on different trial types.
   Now, the trigger is uniform for all trial types.
   Trial type is sorted by 'TrialType' and ''StimDevice'.
   (See 'Trial Trigger Divider' sheet in TDT curcuit file.)
2. For Arduino due. 'tone' function was added in the file, ledpuff.ino
   (because Due don't have builtin tone function)