Moves aggregator settings from variables to config.
function aggregator_update_8000() {
update_variables_to_config('aggregator.settings', array(
'aggregator_fetcher' => 'fetcher',
'aggregator_parser' => 'parser',
'aggregator_processors' => 'processors',
'aggregator_allowed_html_tags' => 'items.allowed_html',
'aggregator_teaser_length' => 'items.teaser_length',
'aggregator_clear' => 'items.expire',
'aggregator_summary_items' => 'source.list_max',
'aggregator_category_selector' => 'source.category_selector',
));
}