This is a bit slow, but more importantly creates a race condition
where e.g. a failing "normal" test will be overwritten by
a succeeding "normal_migrate_from_v20".
This shouldn't ever be a problem since saving dumps the entire
internal state, or is supposed to, at least.
In 2.0, the distance between the points in the TTF request specified
cap height. In 2.1, that was accidentally changed to some arbitrary
value near cap height instead, due to a 72pt factor mess-up.
This commit restores the old behavior.