flow_ebos: do not use BlackoilPropsAdFromDeck anymore

the only thing that was used of this class was the phase usage object,
but the phase usage object can be accessed via much leaner interfaces.

The old BlackoilPropsFromDeck (without "Ad") is still required to
compute the initial condition, but the init code should be refactored
soon anyway.

opm/autodiff/RedistributeDataHandles.hpp

@@ -90,7 +90,7 @@ public:
     }
 
     template<class Buffer>
-    void scatter(Buffer& buffer, std::size_t i, std::size_t s)
+    void scatter(Buffer& buffer, std::size_t i, std::size_t s OPM_OPTIM_UNUSED)
     {
         assert(s==size(i));
         static_cast<void>(s);