Start writing up my understanding of S-corp taxes
Make PDF class even simpler; rewrite 1099 to match

I am just never using the feature where I thought it would be neat to
support:

    pdf['t1-c'] = 1, 2, 3

where three fields match the pattern and so the three values get
assigned, one to each field.  So I am rescinding that option, and simply
assigning values to matching fields in round-robin order without regard
for whether the number of values matches the number of matched fields.
This means that .all goes away, since it becomes simply an assignment of
a single value to however many matched fields have been selected.