WIP: Improve emcee

This branch has ballooned a little as I was working on it but I think the set of features is:

• apply a minimum ln likelihood when drawing points from the prior (default leaves behaviour unchanged)
• add npool and map properties to the base_sampler
• support multiprocessing for emcee
• add new diagnostic plots, similar to the plots for ptemcee, also a plot showing how the mean and variance of the log posterior over the ensemble evolve
• calculate the burn_in using the mean and variance of the log posterior (see !842 (merged))
• use some more of the emcee moves
• port some of these changes also into kombine and ptemcee
• add periodic boundaries into ptemcee

This should probably be broken down into pieces.

cc @gregory.ashton @bruce.edelman for ptemcee and kombine.

added 1 commit

• 8cf8086d - Typo fixes

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These look like great changes all around to me. I had been working on a branch bringing some of these functionalities into kombine already but you have completed a lot more than what I have so far. I'll clone this branch and test the kombine side of things tomorrow and if there is parts of my WIP branch not included here I'll submit a MR after this goes through.

added Sampling label

changed milestone to %Future

Closing due to inactivity.

closed