The following is changed in this commit:
- The constructor for NewtonIterationBlackoilSimple now takes
a parameter object instead of a linear solver.
- The fully implicit black-oil simulators can now use the CPR
preconditioning strategy (by passing use_cpr=true) or the
simple strategy (the default).
Note that as of this commit, the CPR preconditioning still has
not been implemented properly, and behaves just like the simple
strategy.