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Also, do not build the bytecode of the why3 library when compiling
in native code.

It's goal is to allow to view and modify sessions.

Currently three sub-commands :
info : can give the provers used, pretty-print in ascii a session,
     can give the corresponding directory
mod : allow to set obsolete, or modify the archive state of proof attempt
    which corresponds to selected provers
copy : copy a proof attempt by modifing its prover

Split session in two :
Session : an API for managing session without running provers
Session_scheduler : an API for running provers asynchronously

All the global states have been removed.

A session must be first read, which give a session without task.
Afterward it must be updated to the current state of the files with
some environnement and configuration.

printer and iterator are provided for session.

Session_tools : some useful functions on session.

Smoke detector : not anymore integrated to session. Just add the
      transformation "smoke_detector_top" or "smoke_detector_deep" to
      all the valid proof attempt.

prover_id are not yet removed but all is in place in session for that.

Moreover,
- Coq realizations are disabled for Coq < 8.3 due to coqdep bugs,
- Whyconf.magicnumber is incremented to ensure coqc and coqide are called
  with -R,
- realizations for FP arithmetic are disabled if Flocq is missing.

Fix il/li tag

The smoke detector try to detect when a goal is proved
because the context is self contradicting.

The way it is configured in session is not very pretty.

(standalone executable why3realize)