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Main changes are:
- Real constants now offer a normalized representation usable for internal
  computations.
- Constants are no longer stored in textual form.

Add the example about three-idempotent rings

See merge request why3/why3!97

fix #274

Closes #274

See merge request why3/why3!96

When applying a transformation without arguments, this checks that
arguments are indeed not provided. If they are, it now raises the same
exception as transformation with too many arguments.

Also update CHANGES with recent changes.

The merge commit associated was 80605969.
The reason is that these changes to the drivers were badly tested so they
triggered regressions in the nightly-bench

why3prove: Make the output of counterexamples readable by default

Closes #270

See merge request why3/why3!94

ce printing: Add breaking hint in array box. Also refactoring

Closes #273

See merge request why3/why3!95

Resolve "possible improvements in SMT-LIB driver"

Closes #268

See merge request why3/why3!93

Resolve "Transformation apply failed: unbound variable"

Closes #265

See merge request why3/why3!92

Resolve "Removing Inline_trivial"

Closes #263

See merge request why3/why3!91

Add test