Metropolis-Hastings root position sampler #53
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UniformRootPositionSampleto a local one. The local proposal radius dispatches on theUniformRootPositionSamplesubtype and can depend on the total branch length of the tree. (The previous global proposal can be recovered by setting the relative radius to1.0)metropolis_stepto be compatible with Metropolis-Hastings by introducinglog_proposal(modifier, x, y), which is the logarithm of the proposal likelihood ofxgiveny