More streamlined numerical checks

Initialize gamma mixture from conditional coalescent prior

Add pdf

Update mixture.py to use natural parameterization

WIP

Moved fully into numba

Cleanup

Cleanup

More debugging

WIP

Working

wording

Add missing constant to loglikelihood

Skip prior update completely instead of components

Skip prior update completely instead of components

Remove verbose; use logweights in conditional posterior

Move mixture initialization to function

Docstrings and CLI

Remove some debugging inserts

Remove preemptive reference

Fix tests