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Distinguish values from 1) before the loop, 2) the previous loop
iteration, the current loop iteration

Markers everywhere, less todos, and tests for mlw_printer

See merge request !369

This reverts commit 1f45ff36.

Beautify C extraction

See merge request !370

This helps a bit with #476, as the whole function is now ignored, rather
than just some of its local variables.

Print marker for identifiers

See merge request !368

Sometimes Apron introduces variables from Env into the domain,
even though they are not in the term given as contraint. Before
the fix, variales were picked from the variable pool, but since they
are not mapped into any term the inference was failling when
converting domains into terms.

This fix is just a temporary turn-around that makes Apron pick
variables that end up being universally quantified (they are
introduced by the quant_domain).

Add markers to Mlw_printer

See merge request !366