Fix hypothesis_selection not being registered. Patch by Piotr Trojanek.
Fix hypothesis_selection not being registered. Patch by Piotr Trojanek.

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