I'll consider this script to be 99% "obsolete." The script only deals with start and end points, and so makes a different curve
than _DelCorners, for a polycurve with some or all non-line segment portions. It provided some practice in scripting.

The pre-existing _DelCorners script of Max Smirnov will change polylines to the same control point curve,
and also if the polycurve has some or all non-line segments, does some "rounding-off."

- Brian