Path-py

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- 115: Added a new performance-optimized implementation
for listdir operations, optimizing ``listdir``, ``walk``,
``walkfiles``, ``walkdirs``, and ``fnmatch``, presented
as the ``FastPath`` class.

Please direct feedback on this implementation to the ticket,
especially if the performance benefits justify it replacing
the default ``Path`` class.

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- Symlink no longer requires the ``newlink`` parameter
and will default to the basename of the target in the
current working directory.

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- 123: Implement ``Path.__fspath__`` per PEP 519.

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- Once again as in 8.0 remove deprecated ``path.path``.

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- 121: Removed workaround for 61 added in 5.2. ``path.py``
now only supports file system paths that can be effectively
decoded to text. It is the responsibility of the system
implementer to ensure that filenames on the system are
decodeable by ``sys.getfilesystemencoding()``.

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- Drop support for Python 2.6 and 3.2 as integration
dependencies (pip) no longer support these versions.