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This commit removes all hard-coded "infix ..", "prefix ..",
and "mixfix .." from the rest of the code, and handles the
symbolic notation entirely inside Ident. It does not change
the notation itself.

Also, move some model-related labelling from Parser to Vc.

the variables labelled with "model" are kept, so as to produce better
counterexamples

also: declaration of labels grouped together in Ident module

New label can be used to avoid printing type definitions that are
only useful inside ghost, and so we do not want to get them in the
extracted code.

Labels [ocaml:named] and [ocaml:remove] moved into /src/mlw/ocaml_printer.ml

Optional and named arguments in functions signature.
For optional/named arguments in application it requires some more
work around the printer.

Adding a forgeting function for printing variables on exceptions.
Should do the same at least for patterns.
Adding printing functions from why3printer.
Changing exception in transformation so that they
return terms not strings.

Previously, "." was automatically appended to names stored in
model_trace label when creating variables corresponding to record
fields in eval_match and when projecting record fields in the
transformation intro_projections_counterexmp. Now, this is not done
and "." must be given in model_trace label of the projection or
record field.

The reason is that for SPARK, character different from "." (e.g., "'"
needs to be sometimes appended.

were added to original labels.

When eval_match creates new terms from original terms, all labels of
the original terms are copied to the new terms. The exception are
labels of the form "model_trace:*". These labels are not copied if both
original terms and new terms contain this label.

Transformation intro_projections_counterexmp support more
projections for a single type Ty.ty. The projections can have a name
and this name is appended to the name of the function symbol or
predicate being projected.

This is useful for records - for record type, there can be a projection
for each element of the type and the name of the projection can be
the name of the element.

also, ensure that t_label_copy does not lose information

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.

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.

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

Thanks to Johannes Kanig for this useful suggestion.