Uninstall does not delete quotes

The uninstall code delete the content type, but not the content. Add this at the beginning of the function:

function quotes_uninstall() {
  variable_del('quotes_leader');

  // Remove all Quotes nodes.
  $result = db_query('SELECT nid FROM {node} WHERE type = "quotes"');
  while ($obj = db_fetch_object($result)) {
    node_delete($obj->nid);
  }