Astrophot

- Updates to the LM implementation, now more aggressive in the linear regime and more cautious in non-linear regimes. It is possible to turn on geodesic acceleration which helps in some scenarios.
- Sampling slightly more accurate, though smoothing is set to larger value at 1e-3 arcsec.
- Cleaned up the interface for live PSFs, now can simply do: `model.psf = PSF` where PSF is a model object as well.
- Added diagnostic plot for covariance matrix of variables.

Many minor changes for AutoPhot to run on GPU, mostly related to initialization steps. Integration system bug fixed, more integration settings available. Softening changed to reduce chance of nans during evaluation. System for saving/loading models improved.

bug patch related to PSF convolution. Subpixel shifting had wrong units (mixed up between pixel and arcsec).

Zernike polynomials now added to AutoPhot. Zernike polynomials are a good bases for PSF models.

AutoPhot can now fit PSF models live along with the rest of the fit. This means the PSF used to convolve extended sources can be an optimized model along with stars, sky, galaxies, etc.
Added a new juypter tutorial to demonstrate live PSF modeling.
The logo has been updated.
A bug in PSF convolution has been identified and solved. Though further PSF convolution options need to be added in a future release for power users.

The package has been renamed `AutoPhot` to avoid confusion with the previous `AutoProf` package. Along with the updated name, `AutoPhot` now has better handling of coordinates, it can manage different pixel scales between axes, rotated coordinates, `astropy` wcs objects, and more! A number of old methods have been cleaned up as they are no longer needed in the unified coordinate framework. The package now has its own logo and the `github` page has been updated.