Fix ProposalBasedSampler for JointDistribution #665
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jeverink
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Both MH and CWMH samplers could not be used with JointDistribution due to an incorrect initial point.
Closes #658
Closes #659
The current solution is that any
ProposalBasedSamplerautomatically changes theJointDistributiontarget to aStackedJointDistribution, and whenget_samples()gets called, the samples get unstacked to the original geometries.Feel free to suggest any useful tests.