Output only scalar flux variables to exodus file
Running the PyGriffin ABTR example through Workbench results in PyARC crashing since the output Exodus file is too large to be zipped up into a single file. The reason for the file being so large is that the output file contains all flux moments variables by default, which can be a significantly large number of variables if a high-order discretization is used in the solver. This PR only outputs the scalar flux variables to the Exodus file, which should make it so that the PyARC simulation through Workbench no longer crashes.
However, re-running this tutorial example with Workbench V2 results in significant changes attributed to the changes in the input files made here: