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Conflicts:
	src/mlw/compile.ml
	src/mlw/ocaml_printer.ml
	src/tools/why3extract.ml

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

Since we are now testing for the inclusion of [val] declarations inside driver,
such a declaration was causing the test to fail. A possibility is to add a
driver to the test.

Ids in toextract list are now marked with a boolean stating
whether they were extracted recursively or not. This is avoids extracting
unnecessary parts of the file when extracting a single symbol.

No extra annotations needed in order to prove overflow absence.

If [e1] is a ghost expression but [if e1 then e2 else e3] doesn't, then either
[e2] or [e3] (or both) are Eabsurd.

If [e] is a ghost expression but [match e with bl] doesn't, then the first
pattern in [bl] is irrefutable.

"(- x)" is parsed as "(- x 0)", so any context was trivially inconsistent.