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Removes compilation warnings with ocaml >= 4.08

See merge request frama-c/frama-c!2498

Avoids a compilation warning with ocaml >= 4.08.

[ci] ajout de la config dev à CI

See merge request frama-c/frama-c!2484

Avoids a compilation warning with ocaml >= 4.08.

Avoids a compilation warning with ocaml >= 4.08.

[Ival] Restructuring ival, split into 4 files

Closes #613

See merge request frama-c/frama-c!2192

Shares the implementation of the checks between the two files.

Specialize string functions on usage

See merge request frama-c/frama-c!2381

In int_val, removes specific code handling empty sets.
Modifies the function [diff_if_one] that created a set with too many elements
before removing one element.

Fixes #613.

Int_val uses the limit provided by int_set.get_small_cardinal to create
sets or intervals.

In Ival, bottom is now a special constructor.