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That commit caused the declaration list to no longer be reset after each declaration.
Fixing this issue speeds up Gappa printing by 800%.
Abstracted subterms and formulas are now systematically added to extra_decls, since their presence in the global tables does not guarantee they have already been defined.
This guarantee was lost when the tables became global to the transformation, but it was hidden by list extra_decls never being emptied.

Note: removing alpha-conversion does not bring any sensible speedup.

Ensure that the gappa printer does not redefine symbols that were already defined (explicitly or not).

currently only for goal and all

15eb1b44

* 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"

Clarify documentation.