Simplify abstraction transformation now that terms and formulas are merged.
Simplify abstraction transformation now that terms and formulas are merged.

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