outlier on draw functions

[harriet-mason]

Since the outliers are removed when we calculate the hulls (including the convex hull), they should be highlighted in red or something to show that they were not considered when calculating/drawing the hull

[harriet-mason]

Also, there should be a draw function (no graph) that shows the actual scatter plot used in the computations. It is currently almost impossible to see the scatter plot the graph is computed on. Maybe we should set out.rm to be false by default?

[harriet-mason]

also need to change the draw function so that it doesnt recalculate the alphahull when you want to draw it