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Now, there are three kinds of types used in WhyML API:
  ity -- the type of first-order values, "i" stands for "individual"
  aty -- the type of higher-order values, "a" stands for "arrow"
  vty -- the sum of the previous two, "v" stands for "value"

We should probably rename the VTvalue constructor, since it carries
an ity, and not a vty. And I would gladly rename ity to something
more appropriate, too.

Instead, we now store the ghostness boolean directly
in pvsymbols, pssymbols, ppatterns, and exprs. We thus
remove one level of indirection, and vty_value becomes
a one-field record which we remove in the next commit.

This simplifies semantics, makes a lot of checks unnecessary,
and makes us compatible with OCaml.

the Set signature is moved to a separate Extset module,
instead of being included into Extmap.S. The module hierarchy
becomes simpler, we don't shadow  OCaml standard modules anymore,
and the bug #15270 is fixed, too.

+ rename Mlw_ty.ity_pure to ity_immutable

export Why3's extended hash tables as Stdlib.XHashtbl
in order to keep OCaml's Hashtbl accessible. Unlike Stdlib.Map
which fully covers the OCaml's interface, Stdlib.XHashtbl does
not provide polymorphic hash tables.

Util now is a small module containing misc functions.

+ fix a bug in "compare"

+ rename Debug.Opt to Debug.Args to avoid conflicts

+ create AUTHORS file
+ fix the linking exception in LICENSE
+ update the "About" in IDE
+ remove the trailing whitespace
+ inflate my scores at Ohloh

+ do not build src/programs/
+ build the library in lib/why3/
+ fix use_api.ml for the case when Alt-Ergo is not present
+ distribute lib/coq/BuiltIn.v
+ rename src/config to src/why3config
+ rename src/bench to src/why3bench
+ move src/config.ml to src/util/

- get rid of val_decl, the psymbol/pvsymbol is enough
- get rid of vtv_vars, keep the varset in pvsymbol
- include fresh regions in pd_news (will serve for clone)

Merge specifications into program types, as JCF intended.