message: Republic: add -1 food from Farm, Plantation
diff: </Hurry>
  </Hurrys>
  <ImprovementYieldChanges>
  + <ImprovementYieldChange>
  + <ImprovementType>IMPROVEMENT_FARM</ImprovementType>
  + <ImprovementYields>
  + <iYield>-1</iYield>
  + </ImprovementYields>
  + </ImprovementYieldChange>
  + <ImprovementYieldChange>
  + <ImprovementType>IMPROVEMENT_PLANTATION</ImprovementType>
  + <ImprovementYields>
  + <iYield>-1</iYield>
  + </ImprovementYields>
  + </ImprovementYieldChange>
  <ImprovementYieldChange>
  <ImprovementType>IMPROVEMENT_COTTAGE</ImprovementType>
  <ImprovementYields>
  