Enforce gencost.n <= 3 for OPF input data (#114) #7

Job	Run time
code-quality / code-quality	33s
python-tests / python-tests (3.8)	2m 16s
doc-build / doc-build (3.8)	43s
doc-tests / doc-tests (3.8)	1m 28s
wheel-tests / wheel-tests (ubuntu-latest, 3.8)	2m 29s
wheel-tests / wheel-tests (ubuntu-latest, 3.9)	2m 11s
wheel-tests / wheel-tests (ubuntu-latest, 3.10)	2m 10s
wheel-tests / wheel-tests (ubuntu-latest, 3.11)	2m 7s
wheel-tests / wheel-tests (windows-latest, 3.8)	4m 42s
wheel-tests / wheel-tests (windows-latest, 3.9)	3m 37s
wheel-tests / wheel-tests (windows-latest, 3.10)	3m 29s
wheel-tests / wheel-tests (windows-latest, 3.11)	3m 27s
wheel-tests / wheel-tests (macos-latest, 3.8)	3m 27s
wheel-tests / wheel-tests (macos-latest, 3.9)	3m 19s
wheel-tests / wheel-tests (macos-latest, 3.10)	3m 49s
wheel-tests / wheel-tests (macos-latest, 3.11)	3m 29s
publish-pypi / publish-pypi	38s
	43m 54s

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