Codex-africanus

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* Deprecate Python 3.6 support, add Python 3.9 support (:pr:`248`)
* Using `contextlib.suppress` instead of deprecated `dask.util.ignoring` in EstimatingProgressBar (:pr:`256`)
* Disallow numba 0.54.0 (:pr:`254`)
* Upgrade to CuPy 9.0 and fix template encoding (:pr:`251`)
* Parse and zero spectral models containing 'nan' and 'inf' in wsclean model files (:pr:`250`)
* Clarify _wrapper names (:pr:`247`)
* Baseline-Dependent Time-and-Channel Averaging (:pr:`173`, :pr:`243`)

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* Don't let dof go to zero during spi fitting (:pr:`240`)
* Add support for Shapelets and Zernike Polynomials (:pr:`231`)
* Add beam model during SPI fitting (:pr:`238`)
* Add double accumulation option and Hessian function to wgridder (:pr:`237`)
* Upgrade ducc0 to version 0.8.0 (:pr:`236`)
* Add mindet to avoid div0 errors in spi fitter and fix alpha and I0 variance
estimates (:pr:`234`)

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* Upgrade ducc0 to version 0.7.0 (:pr:`233`)
* Fix manually specifying wgridder precision (:pr:`230`)

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* Fix NoneType issue in wgridder when weights are None (:pr:`228`)
* Bounding hull geometric and image manipulation routines (:pr:`192`, :pr:`154`)
* Fix row chunk chunking in Perley Polyhedron Degridder Dask Interface

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* Deprecate old gridder and filters (:pr:`224`)
* Upgrade to ducc0 0.6.0 (:pr:`223`)
* Add Perley Polyhedron Faceting Gridder/Degridder (:pr:`202`, :pr:`215`, :pr:`222`)

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* Add wrapper for ducc0.wgridder (:pr:`204`)
* Correct Irregular Grid nesting in BeamAxes (:pr:`217`)