Python tests

Add `PFMERGE` command. #148

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Run time

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Job	Run time
build-amazonlinux-latest	2m 7s
build-macos-latest	11m 45s
test-ubuntu-latest (6.2.14)	2m 32s
lint-rust	1m 1s
test-ubuntu-latest (7.2.3)	5m 23s
	22m 48s