Some package tweaking make this slightly incompatible with 0.95.

Also redirect error-output during load.

Finally, update URL to the old Scribe.

Remaining problem: blank font — we need to add some font path option (sigh).

Move in two functions from there that don't deserve being in asdf/driver.

and more compatible with new racket-like scribble syntax,
that doesn't do preprocessing on string.
Have exscribe.asd depend on fare-memoization, no longer provided by fare-utils.