- TransportModelTwophase no longer takes pore volume in constructor, but in
the solve() and solveGravity() calls.
- Residual function uses compressibility term (not yet for gravity residual).
- spu_2p now takes a new parameter "init_p_bar", and ReservoirState class
accepts initial pressure as a constructor argument.
- Moved parts of initialization around, since pore volume now depends on
state (pressure).
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