Lenstronomy

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* re-defined half light radius in Sersic profile
* re-named parameter in 'CONVERGENCE' profile
* improved numerics in Galkin
* configuration import design changed

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* JOSS paper added
* improved testing documentation and tox compatibility
* TNFW_ELLIPSE lens model implemented
* ULDM lens model implemented

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* illustration plots for curved arcs updated
* documentation of elliptical lens models updated

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* EPL numba version
* numba configuration variables can be set globally with configuration file
* Series of curved arc models available
* single plane hessian return all for differentials
* elliptical density slice lens model
* vectorized lens and light interpolation models
* updated installation description
* fast caustic calculation replacing matplotlib with skitlearn
* multi-patch illustration class and plotting routines
* updated PSF iteration procedure with more settings

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* cosmo.NFWParam mass definition changed
* QuadOptimizer re-factored
* interpol light model support for non-square grid
* add functionality to psf error map
* fix in multiband reconstruction
* observational config for ZTF
* short-hand class imports

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* SLITronomy integration
* observation configuration templates and examples
* lens equation solver arguments in single sub-kwargs
* adapted imports to latest scipy release
* iterative PSF reconstruction improved
* multipole lens model