Compute a period's DMR values from the plant's own monitoring rows

The numbers a US NPDES permit's Discharge Monitoring Report asks for in one period, computed from the plant's own raw results (daily samples, flows): for each value due on the period's forms (EPA's national limits file) its statistic as EPA defines it (monthly average, daily maximum, weekly average over EPA's Sunday-to-Saturday weeks, geometric mean, loadings in lb/d from concentration x flow x 8.34, percent removal), the rows it was computed from, and EPA's violation rule's verdict against the limit. A value the rows cannot give is refused with its code (fill.no_column, fill.unit, fill.ambiguous, dmr.nd_rule_missing ...): a number the rows do not hold is never supplied. Send rows as JSON (date, parameter, value, unit, point) or table as the file's text (a laboratory's long export, or a sheet of days with one column per parameter); include the previous month's last days when a weekly average is due. A result below detection enters an average by nd_rule (zero, half, dl, dl_lt), else by the state's written rule. netdmr: true adds the NetDMR "Import DMRs" file as text (not yet validated by NetDMR's own import check). The rows reach our server to be computed and are not kept: only how many rows were sent and values filled is counted.