This commit generates the IAQN and RAQN restart vectors pertaining
to numeric aquifers. The arrays are sized according to the number
of records in the input AQUNUM keyword. RAQN is a mix of static and
dynamic information, including the cumulative total inflow volume of
water from the aquifer into the model. IAQN is exclusively static
information.
We add new members to 'AggregateAquiferData' and ensure that the
numeric aquifer arrays remain empty when no numeric aquifers exist
in the model. Add unit tests for these new arrays and update
existing unit tests to account for new dimension items.
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