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- create_env_of_loadpath is now provided in Env instead of Lexer
- find_channel functions now depend on format to determine the
  suitable extensions

in the database given by -d
display only differences, --debug benchdb for other information.

simplify greatly the implementation, work less in advance.

Rebase : Use the new call_prover interface

correct start/stop in bench.

- treat all the prover for one gone, and not anymore conversely

modification

MTask merge with MainWorker

debug    : add more debug

Scheduler : add flag scheduler

Scheduler : Schedule the call, precompute the
buffer in advance.

The final goal is to compare provers, axiomatics and
transformations on specified goals. We also want to have different output

Bench.tool represents the provers, axiomatics or transformations that we
want to compare.
Bench.prob represents on what we want to compare them. The final task are
generated from an environnement and possibly with transformations.

Currently only provers can be compared.