Finish first version of Form 8829
Make sure Form 8829 result is copied to Form 1040
Make 1040 Sch. D fall back to manual results

If line 6 or line 13 has a value provided manually in the input JSON,
then it should be honored instead of any values from the carryover
worksheet, in case someone has the actual values but does not want to
(or now lacks the information to) fill in the carryover worksheet.