We resort to consistently use unique_ptrs in EclBaseVanguard for
the data read from ECL files or set externally. This means that
during the simulation EclBaseVanguard owns this data and not Main
or the ebos setup functions. This ownership transfer becomes
transparent due to std::move.
This came up when trying to fix the parallel runs of ebos and during
that removing some code duplication.
Clarify usage of member variables in FlowMainEbos.hpp by prefixing with
this->.
Also rebased PR on the current master, and updated
flow_ebos_oilwater_brine.cpp according to the PR.
