Further FAST.Farm improvements #60

Job	Run time
build-and-test (ubuntu-latest, 3.9, xvfb-run python3)	33s
build-and-test (ubuntu-latest, 3.11, xvfb-run python3)	30s
build-and-test (ubuntu-latest, 3.12, xvfb-run python3)	33s
build-and-test (macos-13, 3.12, python3)	1m 13s
build-and-test (windows-2022, 3.11, python, --user)	1m 44s
	4m 33s

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