Resolves #266 and improve saved log likelihoods and priors

• For the emcee, ptemcee and cpnest samplers. Adds the log_likelihood and log_prior per sample to the posterior (for CPNest this was already there, but was named differently).
• For all other samplers, the log_prior is calculated after the run based on the samples.
• Modified the prior.PriorDict.ln_prob method to include an axis argument

Closes #266 (closed)

added 1 commit

• e9088810 - Add log_prior_evaluations to the init

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mentioned in merge request !329 (merged)

changed milestone to %0.3.5

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added 78 commits

• e9088810...930280f6 - 77 commits from branch master
• 0372e916 - Merge branch 'master' into Resolve-266

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mentioned in commit f5ff4c20

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