update_6000 is not complete: (not verified) usernames

It adds the field 'uid' to existing table, but does not fill in the values from real nodes, so all usernames in the views get '(not verified)' message. This does the trick:

db_query('UPDATE {node_comments} c SET uid = (SELECT uid FROM {node} n WHERE n.nid = c.cid)');

(if this uid field is really needed at all).