Reorganize imports doesn't understand __all__ semantics

[mcepl]

Say your project only has 1 test.py file that looks like this:

from package import some_name

__all__ = ["some_name"]

After reorganizing imports the from ... import ... line is gone. It should stay.

[mcepl]

By @aligrudi
Rope removes unused imports in organize imports. If
the name is passed to eval() or if it is used in __all__
rope does not detect it. Maybe a new command can be
added to rope that organizes imports but does not remove
unused ones. Alternatively the contents of __all__ can
be inspected, but this is not a clean solution and might
not work in some situations. Patches are welcome.

Ali