Add Sweep to delete default links in wp_links if they remain

[bhubbard]

DELETE FROM wp_links WHERE link_url = 'http://codex.wordpress.org/';
DELETE FROM wp_links WHERE link_url = 'http://wordpress.org/news/';
DELETE FROM wp_links WHERE link_url = 'http://wordpress.org/support/';
DELETE FROM wp_links WHERE link_url = 'http://wordpress.org/extend/plugins/';
DELETE FROM wp_links WHERE link_url = 'http://wordpress.org/extend/themes/';
DELETE FROM wp_links WHERE link_url = 'http://wordpress.org/support/forum/requests-and-feedback';
DELETE FROM wp_links WHERE link_url = 'http://planet.wordpress.org/';