Allow themes to override history table

I have a client who includes very long comments in the workflow comment field. They also have a fixed width theme when node/NNN/workflow is shown. And the result is unnacceptable to them. So I needed to change the way the table is displayed. I had to patch workflow to make it possible.

The patch is attached, and for those who are curious this is how I theme it (gives the comment it's own row in the table, rather than just a cell):

/**
 * Override theming of workflow history.
 * 
 * This table appears on the workflow tab of all content.  We change
 * it because our workflow comments can be quite long, we give them an
 * entire row, rather than just a table cell.
 */
function medemcom_workflow_history($result, $states) {
  $rows = array();
  while ($history = db_fetch_object($result)) {
    $rows[] = array(
      format_date($history->stamp),
      check_plain($states[$history->old_sid]),
      check_plain($states[$history->sid]),
      theme('username', $history),
	);
	// Now give the comment its own row.
	if ($history->comment)
	  $rows[] = array('data' => array(array('data' => check_markup($history->comment),
											'colspan' => 4,
											),
									  ),
					  'class' => 'workflow_comment',
					  );
  }

  $output .= theme('table', array(t('Date'), t('Old State'), t('New State'), t('By')), $rows, array('class' => 'workflow_history', 'id' => 'workflow_history'), t('Workflow History'));
  return $output;
}

This work sponsored by http://www.medem.com.