Rasterio

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- Eliminate unneeded marker for CLI nodata options to be ignored. We will stick
with None (2191).
- Guard against use of gauss resampling when creating a WarpedVRT (2190).
- Prevent segfaults when buffer and band indexes are mismatched in
io_multi_band and io_multi_mask (2189).
- Change comparisons of nodata to IgnoreOption to accomodate changes in click
8.0.
- Use Window constructor instead of from_slices in windows.union to allow a
proper union to be formed from windows extending outside a dataset (2186).
- Read GDAL CInt16 data as np.complex64 and allow saving complex data to CInt16
(2185).
- Skip merge sources which do not overlap the destination.
- Allow unsafe casting in the merge tool, restoring behavior of version 1.2.0
(2179).
- Remove a workaround for an old Python 3.4 bug from the BoundingBox
implementation (2172).
- Add setuptools as an explicit installation requirement.

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- Change usage of super() to be Python 3 compatible only.
- Use numpy.isclose instead of equals when merging float data (fixes 2163).
- The restriction on resampling methods available to overviews has been made
more clear with the addition of a not-yet-public _OverviewResampling enum
(2157).
- Fix a regression introduced in 1.2.2: from_bounds() can again return Windows
of zero height or width.
- Search for GDAL data in installed packages is done before searching in
built-in locations when entering an Env, as is already done when importing
rasterio.env.

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- Add a --nodata option to rio-clip to help support the relative complement use
case (2087).
- Remove boundless keyword argument from WarpedVRT method signatures (2084).
- Implement the advertised intent of warp.reproject's src_crs parameter. It can
override the source's crs (2036).
- A regression in the merge tool's min and max methods has been fixed (2145).
- windows.from_bounds raises WindowError when the given bounds and transform are
inconsistent with each other (2138).
- Support for GDAL's "sum" resampling algorith has been added (2137).
- Cython and numpy versions are pinned in pyproject.toml. Numpy versions
correspond to scipy's oldest supported versions for Python versions 3.6-3.10.
- GDAL data path is configured in env.py with set_gdal_config (2139).
- AWS sessions are not created for pre-signed URLs (2133).

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- Cast rio-calc's nodata option before filling rasters (2110).
- The rio-clip command only works on rasters with rectilinear geo transforms.
This is noted in the command's help and an error will be raised if the
requirement is not met (2115).
- Support for geotransforms with rotation in Window.from_bounds and
feature.geometry_window has been added (2112).
- Fix an off-by-one error in the merge tool (2106, 2109).

------------------

Note well: Python versions before 3.6 are no longer supported by this project.

New features:

- Binary wheels on PyPI include PROJ 7.2.1 and GDAL 3.2.1.
- Support for Azure Blob Storage using an "az" URI scheme.
- Support for RPCs and coordinate transformations and raster warping with RPCs.
- dst_path and dst_kwds parameters for rasterio's merge tool allow results to
be written directly to a dataset.
- In "w" mode the driver keyword argument of open() may be omitted.
- transform_geom() has been optimized for sequences of geometries.

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- The CRS definition saved in RGB.byte.tif has been updated so that it is
identified as precisely EPSG:32618 by GDAL 3.2.1 (2083).
- Remove non-breaking hyphens accidentally added to README, open the file with
encoding="utf-8" when reading the description so that future UTF-8 chars
don't break package setup.