Link to a deleted document opens the deleted document and show empty page

As opposed to the 7.8, when removing a document, we now also keep the original preview node and change the nodetype to hippo:deleted. As a result, this document can now still be opened, but show empty (it is empty, see attachment).

Instead of showing [edit] button, we should be able to show version history and make it possible to [restore] the entire document.

While we are at it, imo, we should also include next to documents, assets, images, etc also expose 'attic' which contains the deleted docs. Thus

documents
--------------
images
--------------
assets
--------------
configuration
--------------

• • • attic ***

This gives some real usage to the attic finally