Update call to show context

In the 4.4 version, context information (description of current term, list of first-level child terms) is displayed via a call to drupal_set_message(). While it more or less works, this is really a misuse of the message display, and causes theme-specific problems since themes may display their messages differently.

Ideally, there would be a way to modify the display of term pages. I've submitted this issue, including a proposed patch to taxonomy.module, to try to address this. If the patch is accepted, it will introduce a new option in the _taxonomy hook that will enable insertion of content. Then then taxonomy_context could display context through a call like:

function taxonomy_context_taxonomy  ($op, $type, $object) { 
  switch($op) { 
    case 'view': 
      if (($type == 'term') && is_array($object) && (count($object) == 1)) {
        return function taxonomy_context_show();
      }
      break; 
  } 
} 

This would require changes elsewhere, e.g., making taxonomy_context_show return content, eliminating the function taxonomy_context_link.