Moves forum settings from variable to config.
function forum_update_8000() {
update_variables_to_config('forum.settings', array(
'forum_hot_topic' => 'topics.hot_threshold',
'forum_per_page' => 'topics.page_limit',
'forum_order' => 'topics.order',
'forum_nav_vocabulary' => 'vocabulary',
'forum_containers' => 'containers',
'forum_block_num_active' => 'block.active.limit',
'forum_block_num_new' => 'block.new.limit',
));
}