add a few inspectors for swaption helpers
add a few inspectors for swaption helpers

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