Handle conflicts due to late returns in conflict_grid properly

This functionality is duplicated in merci_ui as a Block driven by a View. I think this should be removed from merci.module since the merci_ui approach is more flexible.

if (user_access("administer MERCI") || user_access("manage MERCI")) {
      drupal_set_message(t('Warning: @title checked out by <a href="@reservation_link">@reservation_title</a> which was due back @date', array('@title' => $node->title, '@reservation_link' => url('node' . $node->reservation_nid), '@reservation_title' => $node->reservation_title, '@date' => $node->field_merci_date_value2)));
    }