roadef's data was realistically generated, so it wasn't 100% realistic
DefaultPlannerBenchmark.getAverageScore()
PLANNER-122: score versus time graph of type scatter plot (Manually squashed carrot-osc's commits of pull request 21 with some reordering changes)
rename "best score per time" to "best score per time spend"
PLANNER-122: Reuse createScalabilityPlot() to create bestScorePerTimeSpend