Add ability to show data from multiple connections (wifi, wired) on a single graph

[kelseysmithdesign]

Users are interested in the comparison of wifi and wired.

• neither is selected = Both (aggregate, 1 line on the chart)
• Wifi is selected = Wifi only
• Wired is selected = Wired only
• wifi and wired selected = Both (2 lines on the chart)

[rudietuesdays]

Closing; this was merged in via a graph fixes branch (apologies for not referencing the issue)