Add nullcount to stats command #198
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This adds a
--nullcountoption toxsv statsthat keeps track of the number of null values for each column as requested in #48. I just added a single counter to the Stats struct rather than a new type likeTypedSum, etc. but happy to refactor however you'd like.I do wonder whether this this should be enabld by default? It only requires a counter per field, so it seems more consistent with the current behavior for it to be enabled by default.