Dial in get_h().

Further refinements of get_h(), attempting to get it "right".
Fix crash bug, improve calculate() results.

Major oops syntax error got pushed.  Embarrasing.

Improved the sqp() call to get more interations,
and increase the likelihood of returning with a "correct"
answer substantially.

Further, if sqp pre-emptively stops (due to hitting maxiter),
prompt the user to recursively try again, or bail.

Delete some old data that is unlikely to ever be needed again.