Add backward-compatibility for Coq scripts that predate even context sections.
Add backward-compatibility for Coq scripts that predate even context sections.

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