Thrust Curves

Work on the thrust curves has begun. I have introduced a new logical element for holding the curve data, so the curves will be displayed in the logical view just like regular vehicle components, and thrust curves are added to a model by dragging them from the browser onto an engine. So far it is possible to enter thrust value elements in the detail view of the curve, and the elements are displayed within the bounding rectangle of the curve feature. The feature also uses an interpolation algorithm to draw a smooth polyline through the elements, but the algorithm I currently use is unsuitable for this kind of curves. So I'll look for a different one.