visidata-ci-build

[docs] document macros and setcol-precision #1026

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Job	Run time
run-tests (3.7)	2m 21s
run-tests (3.8)	2m 19s
run-tests (3.9)	2m 27s
run-tests (3.10)	2m 26s
run-tests (3.11)	2m 31s
	12m 4s