tweak to only output traded crops for crafty

src/ac/ed/lurg/ModelMain.java

@@ -321,23 +321,21 @@ private void writeCraftyPricesFile(Timestep timestep){
 		StringBuffer sbHeadings = new StringBuffer("Year, Country, Crop,Import_price, Export_price");
 		BufferedWriter outputFile = getFileWriter(timestep, ModelConfig.CRAFTY_PRICES_FILE, sbHeadings.toString());
 
-		for (CropType crop : CropType.getAllItems()) {
-			for (CountryAgent country : countryAgents) {
-				
+		for (CountryAgent country : countryAgents) {
+			
+			Map<CropType, CountryPrice> currentPrices = country.getCurrentCountryPrices();
+			
+			for (CropType crop : CropType.getImportedTypes()) {
+			
 				Map<CropType, CropUsageData> cropUsageAllCrops = country.getCropUsageData();
 				CropUsageData cropUsage = cropUsageAllCrops.get(crop);
 				
 				if (cropUsage == null) 
 					continue;
-		
-				Double importPrice = null;
-				Double exportPrice = null;
 
-				if (crop.isImportedCrop()) {
-					CountryPrice px = country.getCurrentCountryPrices().get(crop);
-					importPrice = px.getImportPrice(); 
-					exportPrice = px.getExportPrice();
-				}
+				CountryPrice px = currentPrices.get(crop);
+				double importPrice = px.getImportPrice(); 
+				double exportPrice = px.getExportPrice();
 
 				StringBuffer sbData = new StringBuffer();
 				sbData.append(String.format("%d,%s,%s", timestep.getYear(), country.getCountry(), crop.getGamsName()));