internal PortfolioConstraints(PortfolioSpec spec, string[] constraints)
        {
            this.ChangedFlag = true;
            constraintString = new StringBuilder();

            // Add string array
        }
 internal PortfolioConstraints(PortfolioSpec spec, ConstraintType constr)
 {
     this.ChangedFlag = true;
     constraintString = new StringBuilder();
 }