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also, remove the "material_type_arg" meta for (->), hardcoded now
in Eliminate_algebraic

add Bool theory support.

  definitions in smtlib-bv driver.
- Add no-bv.gen driver file targeted to provers without support for
  the smtlib bv theory (or for the no_bv variants).
- update realization & tests

Isabelle2015 is still supported, but support for Isabelle2014 has been
discontinued.

A poorly successful attempt to check consistency of bv theory with SMTLIB, using a kind of "SMT realization"

http://michalkonecny.github.io/polypaver/_site/index.html

axioms with a single "remove allprops".

use remove allprops in the driver for bitvectors.

  + size -> size_bv
  + size_int -> size
  + change two_power_size and max_int definitions
  + add axioms to BVConverter
  + new axiom relating nth and nth_bv
  + some reorganisation
- update coq realisation
- modify in consequence the relevant examples and pull the completed ones out of in_progress

Works both with Isabelle 2014 and 2015

To do so, add "overriding" keyword in front of "syntax" in the driver file as in, e.g.,
  overriding syntax function to_uint "(bv2int %1)"

One can only have one overriding for a specific function/type.

The transformation intro_projections_counterexmp now can project maps
with indices of types that should be projected (to type "t_to")
to maps with indices that are projections of indices of original maps
(they are of the type "t_to").

0. define Map.map 'a 'b as an alias 'a -> 'b
1. define Set.set as an alias for 'a -> bool
2. rename HighOrd.func to (->)
3. remove HighOrd.pred
4. update drivers

except for modules/impset.mlw (because of Fset) and modules/mach/*
(because of program cloning), the standard library now typechecks.

This is still very much the work in progress. Many functions and
predicates have still to be converted to "let function" and
"let predicate". Here are some TODOs:
- do not require the return type for "val predicate", "val lemma", etc.
- do not require explicit variant for "let rec" if the code passes
  the termination check in Decl (see list.why)
- what should become "val ghost function" and what should stay just
  "function" (see array.mlw, matrix.mlw, string.mlw, etc)?
- some defined functions in algebra.why and relations.why had to be
  removed, so that they can be implemented with "let function" in
  int.mlw (since they are defined, they cannot be instantiated with
  let-functions). This seems too restrictive. One way out would be
  to authorise instantiation of defined functions (with a VC).
- should we keep the keyword "model"? reuse of "abstract" in types
  breaks syntax coloring ("abstract" requires closing "end" in
  programs but not in types; maybe we can drop that "end" again?).

This commit enable the possibility to change discriminate
behavior from Why3 source files. The 4 metas that configure
the transformation:

select_inst
select_lsinst
select_lskept
select_kept

can now be configured from source files (actually they could
before, but their value was overriden by the drivers).

The behavior in absence of annotation can be specified from
drivers using the 4 new configuration metas:

select_inst_default
select_lsinst_default
select_lskept_default
select_kept_default

They behave as their non-default counterparts, except they
have lower precedence. This avoid the forementioned
overriding problem.

update test suite

add out of bound axiom for nth

test eq_sub

update test suite

new module mach.int.Refint63
new module mach.int.MinMax63
new module mach.matrix.Matrix63
mach.array.Array63: type array renamed into array63