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New standard library equivalent functions:
* ``os.listdir``, ``os.lstat``, ``os.remove``, ``os.rmdir``, ``os.scandir``,
``os.stat``, ``os.unlink``, ``os.path.getctime``, ``os.path.islink``,
``shutil.copyfile``.
Improvements:
* Copy of objects from and to the same storage is performed directly on remote
server if possible.
* Pycosio now raises ``io.UnsupportedOperation`` if an operation is not
compatible with the current storage, this applies to all newly created
function and following existing functions: ``getsize``, ``getmtime``,
``mkdir``.
Fixes:
* ``io.BufferedIOBase.read`` now returns empty bytes instead of raising
exception when trying to read if seek already at end of the file.
* ``copy`` destination can now be a storage directory and not only a local
directory.
* ``copy`` now checks if destination parent directory exists and if files
are not the same file and raise proper exceptions.
* ``mkdir``: missing ``dir_fd`` argument.
* ``isdir`` now correctly handle "virtual" directories (Directory that don't
exist as a proper object, but exists in another object path).