Duplicate Channel Setting

[TommyCox]

There appears to be redundant adding of channels. The initialize function adds channels when passed to the first parameter (line 25), but a few lines below the channels are added again using a loop (lines 27-28).

DAQ-and-laser-API/NIDAQ/NIDAQSweepMeasurement.py

Lines 24 to 28 in ac97760

	# Initialize DAQ
	self.daq.initialize(["cDAQ1Mod1/ai0"],
	sample_rate=self.sample_rate, samples_per_chan=num_samples)
	for i in range(len(self.output_ports)):
	self.daq.add_channel(self.output_channel_list[i])

Personally I think it would be better to let the instrument controller module add the channels internally, and simply send a list of integers denoting which channels to enable. That would make future movement to a generic module easier. What do you think?