Data visualization: distinguish ion counter and Faraday data

[noahmclean]

In "On Peak Intensities by Time" tab for Preview/Review, make the data display easier to interpret by:

Using a different symbol for Faraday (F) and ion counter (PM) data. My ideas are:

• You could use an outlined marker with the same color fill (e.g., use the current filled circle with no outline for Faraday,
• use a darker and/or lighter shade of the current color (e.g., current yellow for 208Pb on F, darker yellow for 208Pb on PM), or
• use a filled circle of the same size but with a black outline for PM data), use a different marker shape (e.g., plus signs or stars instead of circles).

Other ideas would likely work as well. This will distinguish data points on two dimensions -- species measured (e.g., 204Pb vs. 206Pb vs. 208Pb) and collector used (i.e., Faraday vs. Ion Counter).

[bowring]

v0.3.6 has a proposed solution.