message: Archer cannot upgrade to Longbowman
diff: <bMilitaryProduction>1</bMilitaryProduction>
  <bPillage>1</bPillage>
  <UnitClassUpgrades>
  - <UnitClassUpgrade>
  - <UnitClassUpgradeType>UNITCLASS_LONGBOWMAN</UnitClassUpgradeType>
  - <bUnitClassUpgrade>1</bUnitClassUpgrade>
  - </UnitClassUpgrade>
  <UnitClassUpgrade>
  <UnitClassUpgradeType>UNITCLASS_CROSSBOWMAN</UnitClassUpgradeType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  <bMilitaryProduction>1</bMilitaryProduction>
  <bPillage>1</bPillage>
  <UnitClassUpgrades>
  - <UnitClassUpgrade>
  - <UnitClassUpgradeType>UNITCLASS_LONGBOWMAN</UnitClassUpgradeType>
  - <bUnitClassUpgrade>1</bUnitClassUpgrade>
  - </UnitClassUpgrade>
  <UnitClassUpgrade>
  <UnitClassUpgradeType>UNITCLASS_CROSSBOWMAN</UnitClassUpgradeType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  <bMilitaryProduction>1</bMilitaryProduction>
  <bPillage>1</bPillage>
  <UnitClassUpgrades>
  - <UnitClassUpgrade>
  - <UnitClassUpgradeType>UNITCLASS_LONGBOWMAN</UnitClassUpgradeType>
  - <bUnitClassUpgrade>1</bUnitClassUpgrade>
  - </UnitClassUpgrade>
  <UnitClassUpgrade>
  <UnitClassUpgradeType>UNITCLASS_CROSSBOWMAN</UnitClassUpgradeType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  