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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.

- the new syntax for localisation "labels" in Why is as follows:

    goal Toto #"file" line bchar echar#     - after an ident
    #"file" line bchar echar" (A and B)     - before a term/fmla

- the new syntax for buffer relocation is as follows:

    ##"file" line char##

in order to cope with a "two view" syndrom in util.ml/.mli

Perhaps another solution exists

This reverts commit 9809329892bb9637a0137d330ecd08a16ede2d93.

The relevant hash-tables are weak both in keys and values

- copy the code of Pretty to Why3 to prepare it for Driver
- move goal_of_ctxt to Transform, where it belongs 
- comment out the unused "extract_goals" in Transform
- comment out the debugging printing in Theory, use Pretty
- in use_export, put the Duse declaration after the copied
  declarations, not before