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instead of $libdir/plugins. We have no other binary components.

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

* all the provers with the same prover_id are threated as one prover,
* the first description of a prover in the file pdd.conf which have an
  executable with a good version is used,
* the order used to test the executable (exec) inside a prover description
  is not specified,
* a version_bad allows to forbid a version.
* a version_ok matches no warning is printed
* a version_old matches a warning is printed
* if no version matches a warning is printed

z3_smtv2* .drv : factorized

	 of a file into a driver

include "toto.drv.import"

with the task pretty printed, it reduce the set of axioms to a minimal
 set of declaration which still prove the goal and pretty print it.

Currently it does the bisection on the goal already prepared for the prover

rebuild provers-data-conf when necessary; support for Gappa 0.14.0 (but Gappa's driver still to be fixed)

   if they correspond to the default value.

   But the problem for drivers remain.

If magic number doesn't match the file
is moved to "$conf_filename.bak",
and the default configuration is used.

also, never look for a config file in the current directory.
One should use WHY3CONFIG or -C for non-default configs.

"%h:%m:%s:%i" (i for mIlliseconds)

Spass does'nt give cputime but wallclock.
eprover doesn't always give time. so use cpulimit_time for them.

add %b for the memlimit in bytes

from the prover output the time used by the prover.

An intermediate format "h:m:s" is used to accept more output
than only seconds.

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