3.8.0

This is a small release that primarily brings some basic B-spline functionality to the QuadraticSpline2d, QuadraticSpline3d, CubicSpline2d and CubicSpline3d modules, for example:

-- Construct a B-spline and get its individual cubic spline segments
CubicSpline2d.bSplineSegments : 
    List Float -- knot values
    -> List (Point2d units coordinates) -- control points
    -> List (CubicSpline2d units coordinates) -- resulting curve segments

-- Find the knot intervals corresponding to those curve segments
CubicSpline2d.bSplineIntervals : List Float -> List (Interval Float)

In addition, Circle3d now has a toArc function for converting a 360 degree arc (with unspecified start/end point).