Improvments in convergence for flow_ebos

- restrict pressure changes. Set default to 1.0 (this also effects flow)
- change default number of linear iterations to 150
- tell stabilized newton the residual occilates even if it occilates in
only one phase (this also effects flow)
- avoid problems realated to division on small numbers

Tested on SPE9, norne and Model 2 with significant improvments.

opm/autodiff/BlackoilModelParameters.cpp

@@ -59,7 +59,7 @@ namespace Opm
     void BlackoilModelParameters::reset()
     {
         // default values for the solver parameters
-        dp_max_rel_      = 1.0e9;
+        dp_max_rel_      = 1.0;
         ds_max_          = 0.2;
         dr_max_rel_      = 1.0e9;
         max_residual_allowed_ = 1e7;