Move postcode unit files one folder down

.gitignore

@@ -31,4 +31,5 @@ go.work.sum
 # .idea/
 # .vscode/
 
-data/
+data/
+__debug_bin*

cmd/extract_data.go

@@ -71,7 +71,7 @@ func ExtractData(tarBz2File string) {
 				log.Fatalf("Error reprocessing feature collection for file %s: %v", header.Name, err)
 			}
 
-			outputFile := fmt.Sprintf("./data/postcodes/%s.bz2", filename)
+			outputFile := fmt.Sprintf("./data/postcodes/units/%s.bz2", filename)
 			newSize, err := internal.CompressFeatureCollection(outputFile, fc)
 			if err != nil {
 				log.Fatalf("Error compressing file %s: %v", outputFile, err)