//! Creates a spline by list of coordinates: pairs X and Y
//! \param thePoints coordinates of curve
//! \param theIsClosed flag indicating that the result spline should be closed
//! Creates a spline by list of coordinates: pairs X and Y
//! \param thePoints coordinates of curve
//! \param theIsClosed flag indicating that the result spline should be closed
//! Returns the BSpline curve passing through the points
//! \returns Null if Computation of BSpline was failed
//! Returns the BSpline curve passing through the points
//! \returns Null if Computation of BSpline was failed