Adds original ECL index of well connection to PerforationData

and use it in the WellInterface instead of creating a vector
with these indices there. The original approach recreates
information in another path of the well and assumes that all
connections are in a process's local partition. That assumption
does not hold any more for distributed wells.

opm/simulators/wells/WellInterface.hpp

@@ -389,7 +389,7 @@ namespace Opm
         // of states of individual well.
         int first_perf_;
 
-        std::vector<int> originalConnectionIndex_;
+        const std::vector<PerforationData>* perf_data_;
 
         std::vector<RateVector> connectionRates_;