Fixes in the Appelyard in updateState and updateWellState

1) changes dp_max_rel default to 0.2
2) introduces a dbhp_max_rel paramter to restrict the bhp update in the
updateWellState() (instead of using the dp_max_rel) Default is set to
1.0
3) Restrict rs and rv between 0,and the satruation value
4) Set rs and rv to zero for the water only cases
5) Guard against zero rs and rv when calcuating the maximum allowed rs
and rv change.

Tested on norne, model 2 and model 2.2

Number of problems for the different models with and without this fix
Case
this PR master
Norne
10
45
Model 2
21
78
Model 2.2
200
248

opm/autodiff/BlackoilModelBase.hpp

@@ -540,6 +540,7 @@ namespace Opm {
                              int nc) const;
 
         double dpMaxRel() const { return param_.dp_max_rel_; }
+        double dbhpMaxRel() const {return param_.dbhp_max_rel_; }
         double dsMax() const { return param_.ds_max_; }
         double drMaxRel() const { return param_.dr_max_rel_; }
         double maxResidualAllowed() const { return param_.max_residual_allowed_; }