* Prooftree support: fix problem with successive proofs
  (try example.ml with tree turned on, gives exn in Prooftree)
  [da to investigate]

* Prooftree: fix evar support so it works
  Need patch for proof tree program and (maybe) modification of 
  output
  [ma to do]

* PG: add patch for background startup (needs testing)
  [da to do]

* Integrate Tactic recording/proof refactoring (e.g. menu commands)
  [ma to do]