IMO the term "vanguard" expresses better what these classes are
supposed to do: level the ground for the cavalry. Normally this simply
means to create and distribute a grid object, but it can become quite
a bit more complicated, as exemplified by the vanguard classes of
ebos..
the eWoms file naming convention should probably be changed to the one
of the remaining OPM modules, but this is quite a bit of work and IMO
it is more important to be consistent within the module.
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.
Apply swatInit in the initialization
Stop using the equilGrid in the initialization code
Keep The initialFluidState until end of first time step to make it
possible for flow to output it.
hopefully this makes standalone `ebos` arrive at the same initial
condition as `flow_ebos` if both, SWATINIT and threshold pressures are
enabled. we need to calculate the initial condition twice either
threshold pressures and SWATINIT are enabled. (`ebos` and `flow_ebos`
diverged after OPM/opm-core#1129.)
the proposed patch is a kludge IMO, but in the light that in my
opinion, SWATINIT and threshold pressures are both physically not
justified and given the fact that SWATINIT must not be considered for
the threshold pressues should be considered to be a bug of the
reference simulator, I think the patch is okay.
we now store the maximum oil-water capillary pressure and apply it to
the material parameters later. this simplifies things within the
EquilInitializer somewhat and also allows external code (i.e.,
flow_ebos) to choose when SWATINIT gets applied.
