README: Update the roadmap.

README.org

@@ -34,21 +34,6 @@ interaction with Org-mode.
    that I work on the subsequent items decreases with their position
    in the list.
 
-*** TODO Add variable domains to the network
-    I currently define a network as a mapping from variables to
-    functions, but in fact I very often need the /domains/ of the
-    variables for very many operations.
-
-    I started this transformation a couple of days ago, and decided
-    against it, because I thought that some networks may have
-    unbounded domains.  That's right, but stays hypothetical, while
-    right now I need domains with my networks all the time.
-
-*** TODO Review =build-interaction-graph=
-    Check that the definition of this function really follows the
-    definition of the interaction graph.  Pay attention to the
-    existential vs. universal quantifiers.
-
 *** TODO Start writing the docs properly with Scribble
     Convert some of the comments to Scribble, in particular
     module-level comments introducing the modules and each of