Blurb:: Export the MCMC chain to the specified filename

Description::
The filename to which the final MCMC posterior chain will be exported.

<b> Default Behavior </b>
No export to file.

<b> Expected Output </b>

A tabular data file will be produced in the specified format
(annotated by default) containing samples from the posterior distribution.

<b> Usage Tips </b>

<b> Additional Discussion </b>

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