Boxplot support for automated testing charts

[J. Max Mena]

As the title states, and according to ticket:1655#comment:10 we would like to replace the bars in the graphs to a box-plot if there's more than one data point available, which would give us much more information density for the charts.

After talking with Nick, he asked me to write up a ticket and assign it to him so he can possibly get to it in the future.