Use shorts for isosurface indices when applicable #213

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	21s
deploy-examples	0s
tests / Load tox environments	4s
tests / py39-test-all (ubuntu-latest)	3m 54s
tests / py310-test-all (ubuntu-latest)	3m 45s
tests / py311-test-all (ubuntu-latest)	3m 29s
tests / py312-test-all (ubuntu-latest)	3m 41s
tests / py312-test-qt (ubuntu-latest)	4m 17s
tests / py312-test-jupyter (ubuntu-latest)	2m 51s
tests / py39-test-all (macos-13)	9m 54s
tests / py310-test-all (macos-latest)	5m 59s
tests / py311-test-all (macos-latest)	4m 46s
tests / py312-test-all (macos-latest)	4m 58s
tests / py312-test-qt (macos-latest)	4m 34s
tests / py39-test-all (windows-latest)	6m 42s
tests / py310-test-all (windows-latest)	7m 24s
tests / py311-test-all (windows-latest)	7m 15s
tests / py312-test-all (windows-latest)	7m 27s
tests / py312-test-qt (windows-latest)	8m 32s
tests / py312-test-jupyter (windows-latest)	6m 23s
	1h 36m 20s

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