Make qt3scope more robust for experiments

[gadamc]

Vasilis is interested in making qt3scope more robust and useful for experiments. He notes that the following would be beneficial to him

1. Make a save button
2. Allow for scope width to the be changed (longer) via a GUI entry box (I believe this may already be captured in a different Issue)
3. Capture the time of each data point in the trace: currently the DAQ controllers produce a single value from each call to their yield function without a timestamp. Need to determine a way to add a timestamp to the data.