Opt-in per series (series.json poster.headColumns, on for upg100 only), so every other series' sheet is
unchanged. The band is laid out by ONE function that both measureHeader() and the renderer call, so the
predicted header height is the drawn one. Each block is centred in an equal column between short rules,
with the inset the first column lacked. The footer's three blocks are drawn at the 13.5px they are wrapped
and spaced for (they were drawn at 12px), so the text grows with no change to the lines or the band's
height, and they are centred for that size.
SOURCE ONLY: the served copies, the integrity pin and its bundles are regenerated at landing.
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