Restore short type names for int and real in the Coq driver.
Restore short type names for int and real in the Coq driver.

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