Count work only under a budget, and say why a view failed only then (017)

The work budget added about 26 instructions to every row of a table a
host shows (bank, a table of 10,000 rows: +3.0% instructions an ask),
which 017's one-app criterion allows at 1%. A sample put most of it in
show_given asking every cell why it failed, and the rest in evaluate
and the row lookup writing that reason and the count for every cell.

Now nothing is counted without a budget (PureApp.work stays), the
reason is written only when a view, a cell or a row has no value, and
pure-serve asks it only of a cell without one. The table: +0.94%; the
other bank queries within 0.4%. The tests that read the count set a
budget that is never reached.

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