Merge Cellpose In To Main

[SRodwin]

No description provided.

[krpandit]

I put in a few minor comments to change. I also tried running the tests but I got this error below before any tests could actually run. Any ideas why? The tests shouldn't import pytorch, but it should submit a job which does.

E ImportError: Failed to load PyTorch C extensions:
E It appears that PyTorch has loaded the torch/_C folder
E of the PyTorch repository rather than the C extensions which
E are expected in the torch._C namespace. This can occur when
E using the install workflow. e.g.
E $ python setup.py install && python -c "import torch"
E
E This error can generally be solved using the develop workflow
E $ python setup.py develop && python -c "import torch" # This should succeed
E or by running Python from a different directory.