This applet produces a least squares fit of a quadratic function
to a set of data points which you generate by clicking the mouse at
selected points in the drawing canvas. The reported time is milliseconds
required to fit the data. The fitting of the first data set is large because
some one-time links to external routines are being established.
Often, several vertices are identified. We will need some sort of "proximity"
metric to sort out the relevant vertex.