Blurb::Specifies the full matrix format when specifying a
user-specified proposal covariance.

Description::

When specifying the MCMC proposal covariance in an input file, this
keyword declares the use of a full matrix format, i.e., the user
provides all values of the matrix, not just the diagonal.  The matrix
must be symmetric, positive-definite.

Topics::

Examples::
\verbatim
method,									
        bayes_calibration queso
         samples = 1000 seed = 348
          dram
          proposal_covariance
            matrix values 1.0 0.1
                          0.1 2.0
\endverbatim

Theory::
Faq::
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