Blurb::
Datafile of points to assess surrogate quality

Description::
Specifies a data file containing variable and response (truth) values,
in one of three formats:
\li \c annotated (default)
\li \c custom_annotated
\li \c freeform

The surrogate is evaluated at the points in the file, and the
surrogate (approximate) responses are compared against the truth
results from the file.  All metrics specified with \ref
model-surrogate-global-metrics will be computed for the challenge
data.

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