INSTALLATION:
Put the module in a suitable place, eg sites/all/modules/civicrm_address_geocode.
Copy BatchUpdate.php file to /CRM/Utils/Address/ under the location of your CiviCRM php override directory, eg /sites/default/files/civicrm/php/CRM/Utils/Address/BatchUpdate.php.
Before enabling the module in Drupal, optionally change the name of the geofield at line 3 of civicrm_address_geocode.module.