Fixed so that Drupal.settings unaffected by the AHAH request aren't clobbered by the AHAH response. For example: #630328: 'Add another item' breaks autocomplete fields in a FlexiField.
Replaced call to drupal_json() with drupal_to_js(), because the former forces a text/javascript header, and we don't necessarily want that.
Initial release for Drupal 6.
Initial development branch for Drupal 6.
