- Another batch of updates/improvements:

   + introduced basic node permissions ("create", "delete", "update" and
     "view") at the node level: it's up to the "<$node->type>_module" to
     hide gory details (if any).

   + made the "blog it"-feature in the blog and import module work with
     the new node system, in specific with the new centralized forms.

   + made it possible to update blogs.

   + made the page module work with the new node system.

   + various smaller improvements.