instead, let's bit the bullet and add the few lines required for
regula-falsi-Pegasus method whenever the old RegulaFalsi class was
used. note that this leads to slightly different results for the
SPE5CASE1 flow test. I suspect that the old solvers behave in
unexpected ways, though...
Note that because the inverted functions are usually piecewise linear,
inversion can be done in a much smarter way.
this only deals with the easy things, i.e. UgGridHelpers::numCells()
and UgGridHelpers::dimensions(). a more thorough cleanup is needed in
the future to make ebos work with grids other than Dune::CpGrid again.
now, all the beauty of that part of the code can be admired in
initStateEquil.hpp.
During this exercise, I stumbled over some serious code-quality issues
like a different order of the template arguments for the declaration
and the definition, mismatching argument names and no forward
definition of some functions. besides this, some functions were
already defined in the non-_impl.hpp file and EquilibrationHelpers.hpp
used that approach from the outset.
this just moves the hydrostatic equilibrium code from its historc
location at opm/core to ebos/equil and adds minimal changes to make it
compile. this allows to clean up that code without disturbing the
legacy simulators.
