webfm-attach-list can't be styled through css anymore in HEAD

Hi Rob,

while testing the HEAD cvs version w.r.t. http://drupal.org/node/335291 I saw that all the attachment tables now get a unique id like webfm-attach-list-c09. This prevents any possibility to theme *all* webfm attachment list tables from e.g. a theme.

If that uniqe id should be kept, would you mind to add a common class to all those tables? Here's a little patch that does it and adjusts webfm.css so that its settings apply again. What do you think? Patch is against HEAD.