Need to save x and y data in a smart way.

[amcdawes]

The code only saves the y data to a numpy array. It should save both in a somewhat smart way. Perhaps named by the timestamp of the collection, or by the name of the dataset (in a text box?)

[amcdawes]

Fixed by using numpy.savez to save two arrays at once. Not very efficient, but decent. Should still consider a specific naming scheme for file saving.