message: VectorDeltaCoefficient: added a couple of setters
diff: @@ -499,9 +499,13 @@ public:
  void SetDeltaCoefficient(const DeltaCoefficient& _d) { d = _d; }
  /// Return the associated scalar DeltaCoefficient.
  DeltaCoefficient& GetDeltaCoefficient() { return d; }
  +
  + void SetScale(double s) { d.SetScale(s); }
  void SetDirection(const Vector& _d);
  + void SetDeltaCenter(const Vector& center) { d.SetDeltaCenter(center); }
  void GetDeltaCenter(Vector& center) { d.GetDeltaCenter(center); }
  +
  /** @brief Return the specified direction vector multiplied by the value
  returned by DeltaCoefficient::EvalDelta() of the associated scalar
  DeltaCoefficient. */
  