revisit tolerances in assert_allclose in SCC and points tests

[kemccusker]

e.g. see in tests/test_equity.py

assert_allclose(
        expected.transpose(*sorted(expected.dims)).sortby(list(expected.dims)),
        actual.transpose(*sorted(actual.dims)).sortby(list(actual.dims)),
        rtol=1e-4,
        atol=1e-4,
    )

Tolerances are larger than for other tests. Confirm this is what we need.