Custom Search actions do not work if a contact is listed more than once.

The description of the issue is at: http://forum.civicrm.org/index.php/topic,27872.msg118967.html#msg118967

Essentially, any custom search that lists a given contact more than once, then the actions do not work as expected. Almost all the actions assume each contact is only listed once. Also, the hook for using custom tokens also assume each contact is only used once.