- node system:

   + Added the "delete node"-link: apparently it got lost during the last
     commit.  Odd.

   + Changed "Edit node" to "Edit <node_name>" on the 'edit node'-page of
     the admin section.  (There a 4 "Node"s that still need to be removed
     though.)

   + Updated the initial submission page (the old submit.php) to include
     some descriptions.