GitLab

this may be useful if we want to have in an h-consed type
objects that cannot be equal to no other existing or future
value of that type (thus, this objects cannot be reconstructed).
This is more efficient than making comparison return false on
these objects, since we don't need to store them in a week set
at all.

From Max_is_some and Max_is_ge, one can prove that ge is a total relation.
So the consequents hold even if "ge x y" does not (since "ge y x" then
holds by totality).

- move common lexing functions to util/lexlib.mll
- move and rename Typing.create_user_tv to Ty.tv_of_string

  because it is not part of the content of the file, and disallows
  simple diffing

    - only add_edge operation

     The order of the `exec` is the priority order for being the
shortcut. cvc4 should point to the latest or cvc4 if present

- make Whyconf.Args.initialize return the base config file, too.
  This is needed when we change configuration and want to save it.
- make Main pass "why3 <command>" as argv[0]
- remove "-version" options from everything but the main executable

Also:
- don't count "" and "contraption" as available commands
- pass every option except the command name to the command
- provide an option for extended help message

  This is to prevent quantified records from being decomposed by
  eval_match. e.g, assert { forall x:t. ... } was previously
  transformed to assert { forall x1:t1, x2:t2, x3:t3. ... } if x was
  a record type with fields x1,x2,x3. This changed the
  instantiation pattern, which could be harmful.

Also be more consistent when using stdout/stderr.