Fiona

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- The ``encoding`` keyword argument for ``fiona.open()``, which is intended
to allow a caller to override a data source's own and possibly erroneous
encoding, has not been working (510, 512). The problem is that we weren't
always setting GDAL open or config options before opening the data sources.
This bug is resolved by a number of commits in the maint-1.7 branch and
the fix is demonstrated in tests/test_encoding.py.
- An ``--encoding`` option has been added to fio-load to enable creation of
encoded shapefiles with an accompanying .cpg file (499, 517).

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- A post-release has been made to fix a problem with macosx wheels uploaded
to PyPI.

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Bug fixes:

- An extraneous printed line from the ``rio cat --layers`` validator has been
removed (478).

Packaging:

- Official OS X and Manylinux1 wheels (on PyPI) for this release will be
compatible with Shapely 1.6.2 and Rasterio 1.0a10 wheels.

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This release introduces no changes in the Fiona package. It upgrades GDAL
from 2.2.0 to 2.2.1 in wheels that we publish to the Python Package Index.

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Bug fixes:

- Acquire the GIL for GDAL error callback functions to prevent crashes when
GDAL errors occur when the GIL has been released by user code.
- Sync and flush layers when closing even when the number of features is not
precisely known (467).

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Bug fixes:

- Provide all arguments needed by CPLError based exceptions (456).