Please don't forget that z3.drv and cvc3.drv are different.
(cf commit 2010-08-23)

WARNING: do not use SPASS output, which seems to be unsound

also there is smth strange with splitting in sparse_array.WP_create

We try to preserve the order of tasks returned by splitting
transformations.

Revert "Use map_rev instead of map, is the order important?"

if the extension or the format is not recognised