public PercentObjective(
     string title,
     string description,
     int units = -1,
     PercentObjectiveCondition condition = null)
     : base(title, description, false)
 {
     this.Units     = units;
     this.Condition = condition;
 }
 public PercentObjective(
     string title,
     string description,
     bool isImportant,
     int units = -1,
     PercentObjectiveCondition condition = null)
     : base(title, description, isImportant)
 {
     this.Units     = units;
     this.Condition = condition;
 }