This commit introduces a new helper class
Opm::EclInterRegFlowMapSingleFIP
that wraps a vector of
Opm::EclInterRegFlowMapSingleFIP
along with the associate array names (e.g., "FIPNUM" and any
additional "FIP*" arrays). We implement the same operations as the
*SingleFIP type and simply loop over the internal accumulators to
affect the operations.
Add unit tests to exercise the new class, including simulating
multiple MPI ranks that are communicated to a single I/O rank for
summary output purposes.