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a lemma function is introduced with 'let lemma f' or 'let rec lemma f'
it is a ghost function
it must have return type unit and read-only effects
it introduces a goal (its WP), followed by an axiom
  forall args/reads, precondition => postcondition

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.

+ rename Mlw_ty.ity_pure to ity_immutable

eval_match expects a well-formed formula, consistent with the known_map

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/

Johannes, Yannick: yes this is what you think (good news)
but this is not yet completed (bad news)

and Debug.register_stop_flag into register_flag. While information
flags (selectable by --debug-all) are more common, it is safer to
treat a generic debug flag as behaviour-changing by default.

 (metas, debug flags, transformations, formats) except for label.

This description is used in --list-*. The description can use any of
the formatting markup of Format "@ " "@[",...

Transformations can also specify from which metas and labels they
depend, and add informations about how they are interpreted.

TODO:
  - complete and correct the documentation
  - when a transformation use Trans.on_meta, it should be possible to
    add an interpretation of the metas in the documentation.
  - recover a summary version of --list-* ?
  - be able to export in latex?