* call_provers.ml
(prover_update): Adding unimplemented errors that reflects the cases of
proof_attempt_status. Otherwise, proof_attempt_status is a list of cases
that are never reached.
* controller_itp.ml
(proof_attempt_status): Added Uninstalled case in proof_attempt_status.
Launched in replay when asked to replay something not installed.
(print_trans_status): Adding a ! when proof is valid for debugging
reasons.
(report): Added a report type for replay reporting of differences.
(print_report): printing function for report.
(replay_print): callback used with replay to print the report at the end.
(replay): Function that replays all proof attempts of the session.

* session_itp.ml
(session_iter_proof_attempt): Added the proofNodeID the fold function
for convenience.
* why3shell.ml
(test_replay): Added to test replay.