Sep-mw4

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* Same as v1.2.0 but with new wheels for Python 3.10 and AArch64.

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* Changed `numpy.float` and `numpy.int` types for deprecations in numpy 1.20 (96).

* Make it possible to safely invoke C library from multiple threads on
independent inputs.

Global config functions such as `set_sub_object_limit()`
and `set_extract_pixstack()` still configure global params
(once for all threads), while other functions will retain their data
in thread-local storages, so they can be invoked from multiple threads as
long as they work on independent structures.

Library compilation will now require a C11 compatible compiler, which should
be nowadays available on all supported platforms.

* Mark some pointer parameters with `const *`. This is a backward-compatible
change, but makes it easier to extract constants that can be safely shared
between multiple threads and/or invocations.

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* Same as v1.1.0 but with wheels built and uploaded to PyPI. Please report if you
have problems with wheels.

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* Add segmentation masking to the photometry and kron/auto functions (69).

* Add functions `sep.set_sub_object_limit(limit)` and `sep.get_sub_object_limit()`
for modifying and retrieving the sub-object deblending limit. Previously this
parameter was hard-coded to 1024. 1024 is now the default value.

* This and future versions are now Python 3 only. Python 2 is no longer
supported.

* Modernize setup.py with pyproject.toml

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* Fix double-free bug in sep_extract() arising when an error status occurs
and convolution is on. (56)

* Work around numpy dependency in setup. (59)

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* Fix makefile so that `make install` works on OS X for the C library.
Python module and C code are unchanged.