Blurb::
Output file for prediction discrepancy calculations

Description::
Enables the user to specify the name and format of the file to which
prediction discrepancy information is output. The file 
will contain the values of the discrepancy model \f$\delta_i\f$ calculated 
at those points specified with
\c num_predictions, \c prediction_configs, or \c import_prediction_configs

<b> Default Behavior </b>

If \c export_discrepancy_file is not specified, information will be 
automatically output to \c dakota_discrepancy_tabular.dat.

<b> Usage Tips </b>

Dakota exports tabular data in one of three formats:
\li \c annotated (default)
\li \c custom_annotated
\li \c freeform

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