refactor: major API change
fix most examples
fix tests
fix sample reflection
add example of fitting skewed Gaussian
rename loc_fit as glob_fit
rename naive_kl as l
fix example
fix clumsy computation in importance sampling
fix cache updating issue in variational sampling
example to probe fitting errors depending on sampling size
remove verbosisity
refactor LFit class to make it more similar to KLFit
small edit in comment
rewrite example
made sampler model more flexible to handle deterministic quadrature