Generalized lightcurves #1399

Job	Run time
check_commit	10s
ci-tests (Black test, ubuntu-latest, 3.10, black, false)	28s
ci-tests (Py3.8 with old Astropy version, ubuntu-latest, 3.8, py38-test-astropy4-cov, false)	2m 37s
ci-tests (Linux, Py3.10 with coverage, ubuntu-latest, 3.10, py310-test-cov, false)	2m 57s
ci-tests (Windows, Py3.11 with coverage, windows-latest, 3.11, py311-test-cov, false)	5m 21s
ci-tests (Mac OS, Py3.11, macos-latest, 3.11, py311-test, false)	3m 29s
ci-tests (Linux, Py3.11 all dependencies and coverage, ubuntu-latest, 3.11, py311-test-alldeps-co...	5m 16s
ci-tests (Linux, Py3.11 with dev versions of dependencies, ubuntu-latest, 3.11, py311-test-devdep...	3m 48s
ci-tests (Slow tests on Linux, Py3.11, all deps and coverage, ubuntu-latest, 3.11, py311-test-all...	12m 52s
ci-tests (Slow tests on Linux, Py3.11, basic deps and coverage, ubuntu-latest, 3.11, py311-test-c...	6m 15s
	43m 13s

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