Add summary grid plot of saturating suspensions

This adds an additional plot to the summary page that indicates which suspensions tend to saturate with each other. The 1st suspension to saturate in a lockloss goes on the y-axis, and the 2nd-5th saturating suspensions go on the x-axis. The code only looks at suspensions that saturated before the refined lockloss time and does not allow repeats (that come from UR, UL, LR, LL).

Closes #126