message: Enable building solar collectors
diff: <BuildType>BUILD_NATURE_RESERVE</BuildType>
  <bBuild>1</bBuild>
  </Build>
  + <Build>
  + <BuildType>BUILD_SOLAR_COLLECTOR</BuildType>
  + <bBuild>1</bBuild>
  + </Build>
  </Builds>
  <iCost>60</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <BuildType>BUILD_NATURE_RESERVE</BuildType>
  <bBuild>1</bBuild>
  </Build>
  + <Build>
  + <BuildType>BUILD_SOLAR_COLLECTOR</BuildType>
  + <bBuild>1</bBuild>
  + </Build>
  </Builds>
  <iCost>60</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <BuildType>BUILD_NATURE_RESERVE</BuildType>
  <bBuild>1</bBuild>
  </Build>
  + <Build>
  + <BuildType>BUILD_SOLAR_COLLECTOR</BuildType>
  + <bBuild>1</bBuild>
  + </Build>
  </Builds>
  <iCost>60</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  <BuildType>BUILD_NATURE_RESERVE</BuildType>
  <bBuild>1</bBuild>
  </Build>
  + <Build>
  + <BuildType>BUILD_SOLAR_COLLECTOR</BuildType>
  + <bBuild>1</bBuild>
  + </Build>
  </Builds>
  <iCost>60</iCost>
  <iAdvancedStartCost>100</iAdvancedStartCost>
  