Improvements of Trashcan

[Martin Svensson]

Here follows a suggestion of trashcan improvements:

• Change the name of button 'Delete' to eg. 'Remove' to avoid confusion with the rest of the 'Delete' buttons.
  
• Add a 'Delete' button on the trashcan-viewpage when an item is restored. The function should be to set the remove flag again.
  
• Make it possible to follow the dependencies to items that are using the current item. In other word: the icon in Trashcan listpage should also be visible in the list of 'Items using...' on Trashcan viewpage.