fix analog out ch 1 calibration, and calulation of variable ai reference source for 611x
fix analog out ch 1 calibration, and calulation of variable ai
reference source for 611x

Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,olsonse/comedilib