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It should help with some Jessie failures related to arrays of floating-point numbers.

this includes Alt-Ergo both 0.94 and 0.95, and CVC4

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.