whyml: rework Mlw_typing.ity_of_dity
whyml: rework Mlw_typing.ity_of_dity

jpdeplaix/why3,ssaavedra/why3,jpdeplaix/why3,ssaavedra/why3,douglas-larocca/why3,jpdeplaix/why3,douglas-larocca/why3,douglas-larocca/why3,ssaavedra/why3