New event trigger requested

[chrisbloom7]

I noticed that the 3.1 beta includes an event trigger named "changedata-aftersave" which is triggered after the "changedata-save" trigger and subsequent page save. Could you also add one named "page-afterdelete" to be fired after a page has been deleted? I hacked up my own copy of 3.0 to add this event as I needed to update some cached navigation files whenever pages were modified, but it had to happen after all of the changes were saved to disk.