message: Add to mDeathCount rather than overwrite it
  The natural deaths occur first, so should be preserved when additional
  deaths accumulate due to starvation.
diff: @@ -189,7 +189,7 @@ int Population::consumeFood(int food)
  ++i;
  }
  - mDeathCount = populationToKill;
  + mDeathCount += populationToKill;
  // actual amount of food used for the fed part of the population.
  return PopulationFed / 10;
  