Gsutilwrap

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* Made ``copy_many_to_one`` and ``copy_many_to_many`` use a ``Sequence``
for covariant and immutable argument types

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* Moved to github.com
* Moved gsutilwrap.py to a folder gsutilwrap
* Added py.typed to make the module compliant with mypy

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* Added support for long listings

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* Initial version