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remove the keyword "cloned" from drivers, since it becomes
the default and only behaviour (the same for prelude strings).

Also, remove obsolete Printer.print_prelude_for_theory.

File "why3/modules/array.mlw", line 141, characters 2-26:
warning: cloned theory map.MapPermut does not contain any abstract symbol; it should be used instead

Note that warn_clone_not_abstract is not called from clone_export so that
the location of the declaration can be passed.

these return the newly created symbol, saving us a pattern matching
in let_defn.

Now, there are three kinds of types used in WhyML API:
  ity -- the type of first-order values, "i" stands for "individual"
  aty -- the type of higher-order values, "a" stands for "arrow"
  vty -- the sum of the previous two, "v" stands for "value"

We should probably rename the VTvalue constructor, since it carries
an ity, and not a vty. And I would gladly rename ity to something
more appropriate, too.

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.