add scatter plot about kibella

[mastropi]

Problem with current implementation: Plot not correctly updated when we change plotted variables

The plot is not correctly updated when we choose new X- or Y-axis aggregations. Instead, the behavior is the following: NEW points are added to the existing plot corresponding to the values associated to the newly chosen X- and Y-axis aggregations.

For instance: if we start off with a Average Capital Gains vs. Average Age plot, grouped by Citizenship, and then we replace the Y-axis aggregation from Average Capital Gains with Average Capital Losses, the losses are added to the previous plot, but the original Capital Gains vs. Average Age dots are still shown.

2. Legend for grouping variables does not show up

It is not clear to me what it means to have grouping variables in the graph... (e.g. Top 10 Citizenships, etc.) In fact, there is no legend shown in the graph

[Kranf99]

done!