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Speed up SUM calculation in numeric aggregates.
This introduces a numeric sum accumulator, which performs better than repeatedly calling add_var(). The performance comes from using wider digits and delaying carry propagation, tallying positive and negative values separately, and avoiding a round of palloc/pfree on every value. This speeds up SUM(), as well as other standard aggregates like AVG() and STDDEV() that also calculate a sum internally. Reviewed-by: Andrey Borodin Discussion: <c0545351-a467-5b76-6d46-4840d1ea8aa4@iki.fi>
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