v0.3.2 Fix Likelihood + data w/Cov Bug, more QOL

@tomasstolker saves us yet again. Major clarifications and improvements to the package structure (no more binary files, for instance). Fixed a big bug where data with covariance between terms was not included in the likelihood function (this was defeating the purpose of including all our excellent GRAVITY data!) and a few more knobs and user options (like setting sampling style within dynesty - if your sampler is running slowly, try changing the sample_method keyword from 'unif' to 'rwalk' or 'rslice' in system.fit !)