Handling of comment updates

When a nodecomment gets updated, there is no call to nodecomment_save().
- nodecomment_save() is only called on node insert.
- nodecomment_save() only cares about INSERTing, not UPDATEing the comment

I ran into this problem when using nodecomment with workflow.module. When an unpublished nodecomment gets published by the editor, nodecomment_statistics does not get updated.

I fixed this by calling update in hook_nodeapi:

	  case 'update':
		// if this is a comment, update it's parent's comment statistics.
		if (isset($node->comment_target_nid)) {
			_nodecomment_update_node_statistics($node->comment_target_nid);
		}
	  break;

comments.module, on the other hand, is handling updates in comment_save(), which is called by comment_form_submit().
This was not the way to go for my quickfix, as nodecomment calls nodecomment_save() only in hook_nodeapi: insert.