/// Copy constructor
public ChConstraintTwoGeneric(ChConstraintTwoGeneric other)
{
// Cq_a = Cq_b = Eq_a = Eq_b = null;
// if (other.Cq_a != null)
Cq_a = new ChMatrixDynamic <double>(other.Cq_a);
// if (other.Cq_b != null)
Cq_b = new ChMatrixDynamic <double>(other.Cq_b);
// if (other.Eq_a != null)
Eq_a = new ChMatrixDynamic <double>(other.Eq_a);
// if (other.Eq_b != null)
Eq_b = new ChMatrixDynamic <double>(other.Eq_b);
}