- many bugs/limitations in lifting operators to tuples have been worked out:

   - typing/clock calculus/normalization now work properly
   - still, a bug in annot generation (this one is for Ploc !!)
     in file normalization, line 396
 - bug corrected in subtyping
 - scheduling outcome changed:
   - variables appearing in a call output are gathered
   - ease the design of a reusability algorithm
 - liveness/reusability is still a work in progress