MeasurementTool: BezierFigure sometimes creates odd shapes

[donald]

BezierFigure? in JHotDraw sometimes has odd approximation to the curve freehand drawn by user. This problem only occurs when users freehand draw (hold down mouse pointer and draw around shape) not if they individualy click to create each vertex.

Included a temporary fix which normalised the control points in the Bezier figure node. The solution is to remove the arcTo and quadTo methods in the BezierFigure? and keep more of the original control points.