Fixed a few broken tests. Fixed a bug in the uncertainty propagation that led to severely underestimated errors. Included uncertainty of the best-fit parameters in the output (`best_fit_params`). Moved the source code to an `src` folder.
This should be the second-last release before moving to beta.
Fixed some outdated scripts and figures in examples. Fixed issues with unwanted extinction correction in `emcee`. Fixed some typos in the documentation.