This reverts commit 23d273d547, which
fixes#655.
Description of fixed problem:
1. When looping through rows, if a separator was found, all subsequent
rows would not get an assigned alignment.
2. This breaks `s:get_aligned_rows` because it calls `s:fmt_sep` and
`s:fmt_row`, both of which expect `aligns` to have a value for every
row number.