'Delete archived revisions' does not clean up corresponding field revisions

The bug is in function revisioning_delete_archived_revisions from revisioning_api.inc.

function revisioning_delete_archived_revisions($node) {
  return db_delete('node_revision')
    ->condition('nid', $node->nid)
    ->condition('vid', $node->current_revision_id, '<')
    ->execute();
}

It cleans only the 'node_revision' table leaving all the 'field_revision' tables untouched with unreferenced revisions of fields. I'd suggest changing this function to reuse standard functionality from node.module:

/**
 * Delete all revisions with a vid less than the current.
 * Use node_revision_delete from node.module to ensure that we cleanup not
 * only node revisions but also all attached field revisions as well.  
 */
function revisioning_delete_archived_revisions($node) {
  $revisions = db_select('node_revision', 'n')
    ->fields('n', array('vid'))
    ->condition('n.nid', $node->nid)
    ->condition('n.vid', $node->current_revision_id, '<')
    ->execute();

  foreach ($revisions as $rev) {
    node_revision_delete($rev->vid);    
  }     
}