Fix rowmapper generator, check for fields, map users #443 (#583)

* Fix rowmapper generator, check for fields, map users #443

* Formatting

* Remove value store at the end of the import

* Update the notes for the importer about users

* Uncomment importers disabled during testing

modules/Importer/Services/Importers/AirportImporter.php

@@ -25,7 +25,8 @@ class AirportImporter extends BaseImporter
         ];
 
         $count = 0;
-        foreach ($this->db->readRows($this->table, $start, $fields) as $row) {
+        $rows = $this->db->readRows($this->table, $this->idField, $start, $fields);
+        foreach ($rows as $row) {
             $attrs = [
                 'id'      => trim($row->icao),
                 'icao'    => trim($row->icao),