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generated again.

* Makefile.in
Realizations for isabelle are generated even if Isabelle is not installed.
The .thy file are checked only if isabelle is installed. This allows us
to treat it as with coq and be able to detect changes in realizations
with a script.
Dont erase xml generated file during clean.

* configure.in
Changed the configure to always generate a default isabelle version (set
to 2017) for generation of the realization driver (needed even when no
isablle support is given).

* examples/regtests.sh
Adding option --check-realization and --only-realization which add a test
the compares the output of the new realization compared to the one
recorded. It complains if they are different forcing the user to update the
realization files.

* lib/isabelle/*
Adding xml files corresponding to generated realization for Isabelle. This
allows for the abovementionned script to work even if Isabelle is not
installed (which is the case for most people editing theories).

* examples/nightly-bench.sh
Add the option for realization check

* misc/ci-bench
Calls the test for realization

Conflicts:
	examples/regtests.sh

This allows why3doc to generate anchors for operator definitions,
including "(*)".

Different symbols were assigned to constant zero, depnding on whether it
was typed by the user or it was generated by Why3 in the variant-decrease
verification condition, thus causing some TPTP provers to fail.

This commit also gets rid of `int_const_dec (string_of_int ...)`.

This commit also completes the set of converters.

MARCHE Claude authored Nov 23, 2017 and Guillaume Melquiond committed Nov 23, 2017

code for expanding range decls and float decls is now shared between
theories and modules, avoiding any further inconsistencies

That way, unrecognized versions of Alt-Ergo (e.g. 2.0) are no longer
associated to obsolete versions, by default.

It is needed for compiling the Coq tactic Why3.vo file when native
compilation is disabled.

This commit also avoid a potential race condition when Why3.vo was
compiled with both the native and bytecode compilers.