Actions: Update for Drupal 5.0

Here's a patch that brings Actions.module into the land of Drupal 5. There are some reough edges -- it did some nasty things with form redirection, and as a result it now passes an ugly MD5 string in the url for creating a new action. That means that help messages don't display properly on the config screen.

There are probably better solutions -- using different URLs for adding and editing, for example -- but this patch gets things working.