message: Make populationAvailable private
diff: @@ -11,7 +11,6 @@ public:
  int availableWorkers();
  int availableScientists();
  - int populationAvailable(PopulationTable::Role role);
  bool usePopulation(PopulationTable::Role role, int amount);
  void clear();
  @@ -24,6 +23,9 @@ public:
  int size() const { return mPopulation->size(); }
  private:
  + int populationAvailable(PopulationTable::Role role);
  +
  +
  int mScientistsAsWorkers{0};
  int mScientistsUsed{0};
  int mWorkersUsed{0};
  