In the current approach, the full list of summary vectors,
especially those that are defined at the region level, is not known
until we've processed all UDQ and/or ACTIONX definitions. As a
quick solution to this, switch to using the 'SummaryConfig' object
that's defined in the EclipseIO container instead of the object that
gets constructed when reading the input files.
It is likely that we will have to rethink and refactor this
construction process later.
