message: Make old overload of usePopulation private
diff: @@ -23,7 +23,6 @@ public:
  int availableScientists();
  bool usePopulation(PopulationRequirements populationRequirements);
  - bool usePopulation(PopulationTable::Role role, int amount);
  void clear();
  @@ -35,6 +34,8 @@ public:
  int size() const { return mPopulation->size(); }
  private:
  + bool usePopulation(PopulationTable::Role role, int amount);
  +
  int mScientistsAsWorkers{0};
  int mScientistsUsed{0};
  int mWorkersUsed{0};
  