moving localWellsActive and wellsActive to StandardWells

maybe later it can be something general for different types of wells.

opm/polymer/fullyimplicit/BlackoilPolymerModel.hpp

@@ -179,7 +179,6 @@ namespace Opm {
 
         // Need to declare Base members we want to use here.
         using Base::stdWells;
-        using Base::wellsActive;
         using Base::variableState;
         using Base::computePressures;
         using Base::computeGasPressure;