Add the option of computing the full sparity pattern based on all phases

- For some cases (for instance involving solvent flow) the reasoning for
only adding the pressure derivatives seems to fail. As getting the
sparsity pattern is non-trivial, in terms of work, the full sparsity
pattern is only added when specified by the parameter
"require_full_sparsity_pattern"
- For solvent runs "require_full_sparsity_pattern" defaults to true for
all other runs the default is to only extract the sparsity pattern from
the pressure derivatives.

opm/autodiff/FlowMainSolvent.hpp

@@ -107,6 +107,15 @@ namespace Opm
                                                  Base::deck_->hasKeyword("SOLVENT")));
         }
 
+        void setupLinearSolver()
+        {
+            // require_full_sparsity_pattern as default for solvent runs
+            if (Base::deck_->hasKeyword("SOLVENT") && !Base::param_.has("require_full_sparsity_pattern") )  {
+                Base::param_.insertParameter("require_full_sparsity_pattern","true");
+            }
+            Base::setupLinearSolver();
+        }
+
     };