Pixell

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Changes relative to 0.13.2 include:

* A breaking change to map2alm where it no longer approximates WCS if ring weights are unavailable
* Miscellaneous bug fixes
* ducc0 FFT support and fast rotate_alm
* Tiled map support
* New healpix <-> rectpix reprojection API

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Changes relative to 0.13.1 include:

* Added binaries for MacOS 11 Big Sur

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Changes relative to 0.13.0 include:

* Fixes to the MacOS wheel building

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Changes relative to 0.12.1 include:

* Matched filtering in a new analysis module
* Conjugate gradients solver
* Discrete cosine transforms
* Miscellaneous bug fixes

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Changes relative to 0.12.0 include:

* Patch to fix numpy binary incompatibility issues
caused by changes to the numpy C API. We now require
numpy >1.20.

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Changes relative to 0.11.2 include:

* We now use libsharp2 instead of libsharp, which has signficantly faster SHTs
* Major breaking change: the meaning of the "iau" flag has been
corrected and reversed. The default behaviour of map2harm and other functions
using this flag will be different.
* Unified harmonic transforms module
* postage_stamp removed in favor of thumbnails
* Adjoint harmonic transforms