UI improvements (many thanks to @Tahler for the contributions):
- #235,#243 There is now a dual/overlay chart to compare any 2 histograms
- #237,#240 In the multi (>= 3) chart, show the QPS on right axis (can be turned on/off like all other data on the chart)
- #238 The URL is now updating and encoding settings such as logarithmic axix, max, and which data file is being graphed
Misc: