Update TODO

TODO.t2t

@@ -323,11 +323,8 @@ Work to do in OwlPS
   - algorithms (parallelize computation of the different algorithms for
     the same request);
   - and/or requests (parallelize computation of several requests).
-
-  It would be possible (overkill?) to have a group of worker threads
-  and a job queue.
-
-  See OpenMPI & friends.
+  -
+  See OpenMP.
 
 - ReferencePoint: the request list should be an unordered_set instead of
   a vector, to guarantee the unicity of the elements.