_simplenews_scheduler_new_edition() should take care of database records

Here's a patch.

Committed this rerolled patch.

Possibly needs porting to D7.

This seems to be taken care of here in D7:

  // Insert edition data.
  $values = array(
    'eid' => $edition_node->nid,
    'pid' => $template_node->nid,
    'date_issued' => $edition_time,
  );
  db_insert('simplenews_scheduler_editions')
    ->fields($values)
    ->execute();