Added missing arguments to SwapRateHelper constructor.
Added missing arguments to SwapRateHelper constructor.

fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG,fabrice-lecuyer/QuantLib-SWIG