Box plots

[SCiarella]

all the J from the same turbulence can be plotted on a single graph that either uses boxplots, or multiple colorshades for different confidence intervals

[SCiarella]

this can be combined with #50, by reformatting the scoring function in order to:

• [x] select the speckle to plot using some criterion, e.g. one per interval of J_i
• [x] plot all the speckles from the same {J_i} together
• [x] use colorshadows and lines to represent the statistics Then additionally it is also interesting to
• [x] use the same spleckle groups for the average plots (which could probably be made more efficient in this way)

[SCiarella]

Commit 140a2c5588671b9e2a3f3edb268b046049331c48 solves this issue by improving the plotting functions