Make fork iterators homogeneous

[eleftherioszisis]

[mgeplf]

only the tests/test_mixed.py tests fail, does that mean this is backwards compat?

[eleftherioszisis]

only the tests/test_mixed.py tests fail, does that mean this is backwards compat?

Nope. The test_mixed.py tests both subtree enabled and disabled feature calculation.

However, it is true that for a morphology with homogeneous neurites, there would be no backward break because of these iterators. Only in the case of artifacts, e.g. a mistyped section, the homogeneous fork iterator would skip the forking point.

[eleftherioszisis]

Closing for now. We may revisit it in the future.