Adds a simple check-point plot option to see progress

Adding check_point_plot=True to run_sampler, on each check-point save, we generate a trace plot.

This will be useful for long-running jobs to see how the sampler is progressing. Here is an example of a partially complete run on Gaussian noise

This is a great idea!

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added 48 commits

• ba410477...5ae5e02a - 47 commits from branch master
• e942edc1 - Merge branch 'master' into add-checkpoint-plot

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mentioned in commit 605b023c

merged