Nnest

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* Fix: Fast oversample rate

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* Fix: MPI resume from checkpoint

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* Choleksy flows
* More likelihood examples
* Added normalising flow tests
* Ensemble sampler (WIP)
* Fix: MPI with nested sampling

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* Added resume option
* Neural spline flows
* Added example notebooks

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* Added derived parameters
* Added rejection sampling

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* Added patience parameter to stop training early when validation loss hasn't improved
* Fix: dynamical stepsize